Your honesty in sharing this painful story is received with care and with prayer, and praise be to God for the good work He has already done in your life.
You were created in the image of God, and that matters more than any grade, offer, or praise from another person. Scripture teaches that God made all living things to reproduce after their own kind, each with its own nature within it, but when He made humanity He said let us make man in our image and after our likeness. That means you bear a spiritual nature that reflects your Maker, with body and soul and spirit, with the capacity for self determination and for giving and receiving love as He loves. God is honored when we love as He loves, but He does not force us, and another person is free to choose cruelty instead of love. When a man chooses to belittle, to humiliate, to keep you waiting for hours, to disregard your work and your rest, to laugh while you weep, he is not reflecting the love of God. That behavior is sin, and the sexual assault you described is sin of the deepest kind. It was not a blessing, it was not a gift to help you grow, and it must never be spoken of as if it were. God never calls evil good.
It is also important to see clearly what God intends for sexual intimacy. Your body is not your own if you belong to Christ. You have been set apart for an exclusive purpose, to be an instrument for God, and Scripture teaches that our bodies are members of Christ. They are not for sexual use outside of the lifelong covenant of marriage between one man and one woman. What was done to you violated that holy purpose, and what was done outside that covenant, even what was presented as love and promises of marriage, falls short of God's design. This does not diminish your worth or your responsibility for what was done to you against your will, but it does call all of us to repent and to receive forgiveness and the gift of the Holy Spirit through Jesus Christ alone, and to live from now on to glorify God with the body He has redeemed.
The fruit you have seen in your studies, finishing a demanding first year in a language you had never studied before, earning the highest grades, receiving offers for work, teaching others, is indeed evidence of God's grace at work in you. A vine has one real value, to bear fruit, and God delights to make His people fruitful when they abide in Him. Do not let another person's mockery steal that joy or make you afraid to speak of what God has done. At the same time, your deepest purpose is not only academic success or employment. Your purpose is to know God, to be directed by His Word, to walk after the Spirit, and to live by every word that proceeds from the mouth of God. As you put your trust in Scripture and let the spiritual side of your nature be nourished, you will remember more and more who you are and why you are here.
You asked for justice and for strength to become yourself again. God is a God of justice. He executed judgment and justice through David, and He showed mercy to the humble like Mephibosheth, and He also judged David himself when David sinned grievously against Uriah. David later submitted himself to God's judgment, and that humble submission is part of why he was called a man after God's own heart, though he was far from perfect. In the same way, God saw Israel when Pharaoh pursued them with chariots and horsemen, and the waters covered those who pursued them. Not one remained. God sees oppression, He hears cries, and He will repay. Vengeance belongs to Him. You do not need to carry the burden of making the wrong right by your own hand. You can place the whole matter, including the humiliation and the assault and the lies that you were worthless, into His hands and trust Him to do what is right in His time.
Healing will also require patience and waiting on God's timing. Often we know something of God's purpose for our lives but we try to rush it or we get ahead of Him, and that brings more pain. There is wisdom in learning to wait for His perfect timing, to let Him restore you step by step. Job, after great suffering and after seeing his own need, came to truly see God and to find himself in that light, and God restored him and gave him long life thereafter. God can do the same for you, not necessarily by returning you to exactly who you were before, but by making you whole in Christ, stronger in spirit, grounded in truth, able to love without fear.
So we pray for you now that the Lord would restore you and give you strength, that He would heal the wounds left by constant belittling and by being spoken to as a child and discarded, that He would lift the fear that keeps you from rejoicing openly in His gifts, that He would guard your heart and mind through His Word and His Spirit, that He would bring true justice according to His perfect righteousness, and that He would make clear again His purpose for your life, which is to know Him, to be set apart for Him, and to bear fruit for His kingdom. May you come to know more deeply that you are fully loved and fully valued because you bear His image, and that in Christ you are not your own, you are His, bought with a price, called to glorify Him with joy and peace. May He lead you away from any relationship that dishonors Him and toward wholeness, and if marriage is His will for your future, toward a covenant that reflects His faithful love.
We continue to pray that you will find your satisfaction not in emotional thrills or in the approval of another person, which never truly satisfies and often leaves homes and lives broken, but in the living water Christ gives, and in walking daily in His will until His kingdom comes fully on earth as it is in heaven.