There is a gracious desire in your words to hear from God in the midst of challenges, and that desire itself is to be commended, for the Lord does speak, and He has preserved His Word century after century that we might hear His voice with freshness and power. Yet we must take care to hear what He has actually said, rather than what our own hearts wish He would say.
The saying you have quoted, though meant for comfort, does not give the comfort of the gospel. It tells you that you are strong and that you can conquer all and that you are never alone because you are always with you. Scripture gives a very different word, and a far better one.
First, it is not true that God never gives you more than you can handle. He often does, that you may learn you cannot handle it alone. When there remains no strength in you, nor any ability of any kind, then you are to fling yourself upon the divine strength and lay hold upon it. The promise is not that your strength will suffice, but that they that wait upon the Lord shall renew their strength. To him who waits upon Him, the joy of the Lord is his strength, and the Lord Jehovah Himself becomes his salvation. All strength of every sort comes from God, and He must have the glory of it. You are not the glory of your own strength, He is the glory of your strength.
Second, you are not strong in yourself. The most desirable thing is to be strengthened with strength in the Lord, for quiet strength from Him is better than fussy weakness in ourselves. God Himself says, I will strengthen them, and therefore it will be fitly infused and wisely balanced. If we fall into decline and weakness, we are not to stop there, but to seek that He would fulfill His promise to renew us by complete reliance upon the merit of Jesus.
Third, to say you are never alone because you are with yourself is to leave you still alone. There are seasons when as man you most need human sympathy and find none, and there are sorrows of loneliness that coarse notions of fellowship cannot cure. Our Savior knows this loneliness, for He was left alone just when as man He needed comfort, that He might bear the sorrow fully for His people. The true cure for lamented loneliness is not to look inward, but to seek heavenly company. The words of God's Book made living to you shall be as angels to your mind, and God Himself shall have fellowship with you. What the gospel declares is not that you are with you, but that God is with you, Emmanuel, God with us, and that He will never leave nor forsake those who trust in Christ.
If you would hear God saying something today, hear what He has said in His Son. The blood of Jesus Christ, God's dear Son, cleanses us from all sin, and who shall lay anything to the charge of God's elect when God has justified them. Salvation is through Jesus Christ alone, and while you are yet without strength, you are called to believe that Christ died for the ungodly. That is God's work and God's work alone.
We pray for you that you may not trust in your own strength to conquer, but that you would wait upon the Lord, confess your weakness, and look to Christ who was left alone that you might be brought near. May the Lord teach you from your youth and through every trial, and make you to declare His wondrous works, not your own, and may He strengthen you with His own strength to walk up and down in His name.