Please help

Ry • wonderlost~
So my boyfriend is absolutely amazing at making me orgasm, really quickly. But as soon as it starts, i stop him because it just doesn't feel right. Like not the relationship, but the orgasm. At first it feels amazing, after it just feels un right. Not painful or anything, just wierd. Like, I'm not sure if it's just something I get used to, or what's going on. What do you guys think?