I dry out during sex & my clit isn’t sensitive anymore

Hey y’all, im 20 years young 5ft & 165 lbs. lately I’ve noticed that when me & my bf are having sex I start to dry out after 10-15 minutes. & my clit doesn’t react to vibrations anymore. I used to be able to finish in under 5 minutes & I would stay extremely wet the whole time & now I can’t finish at all & im drying out to the point that it starts to become uncomfortable & we have to stop…. The only difference between before & now is that i have put on more weight in the 4 years we’ve been together… could my weight gain be the problem or should I talk to a Dr about this?