I SUCK at being on top!?

So I've been with my bf for two years and I RARELY get on top... Usually it's because whenever I do it's extremely loud and I have to stop, but I lowkey use that as an excuse not to ride him. 
Don't get me wrong, the sex in our relationship is great. I'll do anything else and my bf is practically a porn star. I just wish I was better at riding him and I feel like I have no stamina. My legs feel like they're about to fall off if I ride him for more than 2 minutes 😩 any advice?!?