I can try to help you, but I have to know more about your game. For example, what type of grip do you hold your racket with? And do you play one-handed all around, or do you have a two-handed backhand. The first time I lifted a tennis racket was 3 years ago, and since then I have played as much as I could, and I taught myself the game. I have a lot of fun playing it, and that is what you should also focus on when you play. It is a game, you need to have fun if you want to improve.