Nobody knows how good they can be unless they give it a shot.
I happen to know 4 guys that have borderline pro talent (or better) and they all took different routes, and none of them really made it, except for a top 10 on the Nationwide or two, and the most talented one never even tried.
Two of them played college golf and then mini-tours. One of them went to Q-School and qualified for the Nationwide Tour (and missed the PGA Tour by one stroke) and won the State Amateur. One of them moved to Florida and played some Mini-Tours and finally gave it up...And the most talented one got a job in a factory and never had any desire to do any more than play in our local Saturday games even though some local businessmen offered to sponser him if he wanted to give it a shot. I told him one day after a round where he shot a 61 that I was certainly glad I didn't have his game. He looked a little surprised and asked me why. I just said that if I had his game I wouldn't be able to sleep at night from wondering how good I really could be if I gave it a real shot.
The main thing to do is play as much competitive golf as you can play.