Specials issues

I feel terrible for doing this... but my SO hasn’t been able to make me orgasm in 7 months although I always tell him he does. I don’t know what’s wrong with me, I can do it solo but sometimes when we do the deed I feel his parts kinda click in my stomach and it grossed me out. I’m a short girl 4’5 and he’s 6 something so does it have to be with heights? Or is it something I’m doing wrong? Also he wants me to deep throat and I want to but I hate gagging. Any ideas?