Practice drawing from life more, look at other people's drawing styles, compile all the examples of life and then use them as references for your own style. It's a gradual thing, but you still already draw better than I did at your age. Don't be discouraged. When you feel lost, thank God for your talent, understanding it is His talent that He has blessed you with, that all gifts are from the Lord. Imagine that creativity and skill flowing from Heaven to you, that you are his instrument.