I'm thankful your sister cares so much about you that she is urging you to turn to Jesus. No matter who we are or what our situation is, it's better to face life's problems with Jesus than to face them alone.
Does this mean all your problems will suddenly vanish if you commit your life to Christ? No, not necessarily, although some of them may. But Christ will give you a new purpose in life—a desire to live for Him instead of for yourself. And when we put God's will first in our lives instead of our own desires, many of the conflicts and problems we face will begin to fade. The Bible says, "The way of the Lord is a refuge for the righteous" (Proverbs 10:29).
But God also will give you wisdom to deal with your problems. When we come to Christ, God Himself comes to live within us by His Holy Spirit—and one of His purposes is to help us when we face difficult times. We also have the privilege of prayer, asking God to direct us and give us wisdom. Our prayer should be the same as the psalmist's: "Direct my footsteps according to your word; let no sin rule over me" (Psalm 119:133).
By a simple prayer of faith ask Christ to come into your life today. Then ask Him to help you deal with the problems in your life that you can solve, and to give you the strength to bear up under those you can't.