Is it normal that i can't cum?

Warning: NSFW and TMI

So, I cannot manage to cum! Like, at all. When I say I've tried everything, I really have. I won't go into grimy details but if its a common thing, I've tried it. I've read every google article on the mystery lf femal ejaculation and nothing has worked for me. I embarassingly even have an entire arsenal of toys under my bed in all different sizes and shapes that never work out. My boyfriend seems to be getting distraught by the fact that my body simply won't comply and its embrassing for me too.

It's not that I don't feel good. I really do. I can go for hours until I finally get sleepy or feel content. One time I felt so wonderful that I actually ended up fainting. My boyfriend is no small guy (He's about 8 inches of perfection) and he's a good listener in bed. Sometimes there's what feels to be a buildup but nothing happens, it just goes away. Am I normal? Should I go to a doctor?