This isn’t about being a rebel, it’s about proving to yourself and others what you’re capable of accomplishing. Sure, it might be better to achieve something because you want to but if you are motivated by proving others wrong, then use it to your advantage.
Plenty of people were able to graduate from college just because someone told them they couldn’t. Plenty of people have gone from fat to fit after being told it’ll never happen. From creating a successful business to running a marathon, sometimes, just the thought of someone saying, “I told you so” can inject enough drive and motivation into your system that success becomes a sure thing.
Some people let other people’s negative opinion force them to give up on their dreams. Don’t let this happen. Don’t give them the satisfaction of being right. If possible, turn their destructive words into fuel and use that to propel yourself toward success.