I'm Young, Which Is Why I Feel Anxious Asking For

I'm young, which is why I feel anxious asking for help in this situation, but my boyfriend and I have been together for almost 3 years. I haven't been on birth control for 2 years, we've never used condoms and we are intimate at least 4 times a week. But 2 years later and I have still yet to get pregnant. I only stopped taking my birth control becuase I was switching form the pill to a shot, and then once i remembered to renew my shot when, it was already inactive and I just never went back. I've wanted to get back onto birth control many times but at this point becoming pregnant would be a relief to me, even if its a little early, because i'm so scared I won't be able to have babies, since it has yet to happen. I feel like any doctor would think I'm crazy for trying to have a baby, but I just want to know if I even can. I just have this feelings something wrong i dont want to go into my 20s to find out there was something i couldve done to help... What should I do to see whats wrong with me and how to fix it?