Playing Style Issue

I started playing table tennis about 1.5 years ago. At the begining, by looking at the other players i started playing a lot of chop shots. As a result of which now my playing style has become totally based on chops which makes it impossible for me to play proper forehand shots or hit a forehand smash or even do a top-spin serve.  How can I change my playing style so that I am able to play forehand instead of just chops. I really appreciate the advise as this style is causing problems for me.

I use the model Timo Ball 1000.