Am I the only one?

Any other ladies have trouble getting off with intercourse? I come so close but just don't...and I feel bad because I feel like something is wrong with me...I've talked to my SO about changing things up and trying new things but he's not that experienced and wants me to help him, which I'm fine with obviously...does it get easier with age? Does anyone else have this problem? I feel bad because I really do enjoy our together time, just wish it would spice up a little bit...advice??