What’s wrong with me?

I’m almost 21 years old & I’ve been with a less than a handful of people and have never orgasmed. I’ve never really masturbated much bc I’ve never really been a “horny person” (even as a teen). For some reason it makes me very insecure that haven’t been able to/ can’t. I’m convinced something is wrong with me. My current girlfriend is amazing but I still haven’t been able to cum. She’s the first person I’ve ever used a strap-on with and that hasn’t done anything for me either. Am I thinking about it too much? Is there something I should try? Would a vibrator help? Has someone had this issue before and was able to figure it out? Any advice would help at this point bc it’s killing me.