We understand your struggle and desire for personal growth, fulfillment, and marriage. Let's bring your concerns before the Lord in prayer and seek His will for your life.
Firstly, we commend you for your desire of marriage. This is a gift of God. It is written,
I know that nothing is better for them than to rejoice, and to do good as long as they live. It is also a gift of God, that every man should eat and drink, and enjoy the good of all his labor, is the gift of God. I know that whatever God does, it shall be forever. Nothing can be added to it, nor anything taken from it; and God has done it, that men should reverence him. That which is has been long ago, and that which is to be has been long ago: and God seeks again that which is passed away... Then I commended mirth, because a man has no better thing under the sun, than to eat, and to drink, and to be joyful: for that will abide with him in his labor all the days of his life which God has given him under the sun. Ecclesiastes 3:12-15, 8:15 (WEB).
God has a plan and purpose for you, and He can turn your situation around. Give Him the opportunity.
Beloved, we urge you to trust in the Lord's timing. His timing is perfect, and He is never late.
He has made everything beautiful in its time. He has also set eternity in their hearts, yet so that man can't find out the work that God has done from the beginning even to the end. I know that there is nothing better for them than to rejoice, and to do good as long as they live. It is also a gift of God, that every man should eat and drink, and enjoy the good of all his labor, is the gift of God. I know that whatever God does, it shall be forever. Nothing can be added to it, nor anything taken from it; and God has done it, that men should reverence him. Ecclesiastes 3:11-14 (WEB)
When we feel like we are behind God's schedule, it means we are using our own understanding and not trusting God's will. This is relying on your own understanding.
Trust in Yahweh with all your heart, and don't lean on your own understanding. In all your ways acknowledge him, and he will make your paths straight. Proverbs 3:5-6 (WEB)
Regarding online dating, be cautious and discerning. It's important to seek God's will and be equally yoked with a believer.
Don't be unequally yoked with unbelievers, for what fellowship have righteousness and iniquity? Or what communion has light with darkness? 2 Corinthians 6:14 (WEB)
Let's pray for God's guidance and wisdom in this area.
As for your mother and sister, remember that God calls us to honor our parents.
Honor your father and your mother, that your days may be long in the land which Yahweh your God gives you. Exodus 20:12 (WEB)
Pray for them and ask God to give you patience and wisdom in dealing with them.
Lastly, be encouraged. God has a plan for you.
For we are his workmanship, created in Christ Jesus for good works, which God prepared before that we would walk in them. Ephesians 2:10 (WEB)
Let's pray.
Heavenly Father, we lift up our sister in Christ to You. We pray that You will guide her steps and bring the right godly husband into her life according to Your will and in Your perfect timing. Help her to trust in You and not lean on her own understanding. Give her wisdom and discernment in her relationships and help her to be equally yoked with a believer. We also pray for her family, that You would soften their hearts and help them to support and encourage her. Help her to honor them as You have commanded. Lord, we know that You have a plan and purpose for her life. Help her to seek You first and to walk in the good works that You have prepared for her. In Jesus' name, we pray. Amen.
Prayer Focus: God, Thank You for loving me. God, I ask You in Jesus’ name please bless me with everything that I stand in need of and everything You want me to have. 
