You will NEVER know if you are GOING to be. This is a profession where you only find out AFTER you get there. At music school there were plenty of players better than me. Most of them don't play anymore. There is a combination of talent, attitude and luck. The first two you can do something about, the last finds you - or it doesn't. You increase your chances by studying with a plugged in local pro. They can get you into the scene if they think that you are worth it. That is up to you.