Orgasms?

My boyfriend and I have been together for a year and a half and we've had sex well over 100 times and I've only orgasmed three times....😩 I don't know if it's me or he thinks it's because he's not big enough...but he's a pretty normal size I think? He's the only guy I've ever had sex with but I want to orgasm and my boyfriend wants me to also! But I don't know what to do or how to get there while having sex? I orgasm every time I masterbate but I want to orgasm with him. We've done a bunch of different positions, like cowgirl, reverse cowgirl, doggie style, standing up, missionary, and a few others. Help! I need advice, positions, anything! I'm self conscious about him eating me out...I feel like it tastes bad...and he's weird about stuff like that. Ugh 😞 Any advice will help!