Hey there. So to the important part, your emotions are valid. Your thoughts are normal. That said, you’re both rather young and sexually immature. Not immature like childish, but young 20’s is just not sexually adept the majority of the time. His body count doesn’t matter. Neither does yours. There are people with high body counts but their shit partners because they don’t take time to care for or learn about their partner. The type of partner you are, makes you what you are. Not how many people you’ve slept with. Him being with other people doesn’t make him less or more worthy than you and your pleasure. It’s equal. Your together so you’re both equal, through and through. You BOTH have the task of learning and growing together, sexually and otherwise. Being a present and giving partner is key, and so long as you both do that, and communicate frequently, things will work as they’re supposed to. You can always choose to confide in a therapist and work through these harmful mental thought processes about you not being worthy, as insecurities are common, but need to be worked through individually and as a unit.