The big O missing.

Hi! I'm 22, and I've only had sex once, when I was 19. In a nutshell (just in case some of you are wondering 😂) I feel very uncomfortable with my body, so getting naked with someone it's pretty much the description of nightmare for me. So, I've been going solo at it (talking about masturbation) but I've never been able to reach an orgasm. Now I'm dating this guy, and I even experienced oral sex for the same time (yaaay for me) but I still couldn't get there. So...... any tips?