<human>: Can you condense the text into a few key points?

My SO (22m) and I (18f) have been together for 5 months now. When we first hung out he told me about how he slept with countless girls but I thought he was just showing off. He told me later he remembered sleeping with 16 or so girls. Finally I asked about his past sex life in more details. I learned that he would get black out drunk and wake up in weird houses. At that point I stopped asking. I know he spent many years traveling and would spend nights drinking in countries he had never been to before so I don't have any clue how many girls he's slept with. He always wears a condom and I'm making him get tested but I fell I secure. I'm his first real girlfriend, he says I'm the best he's ever had but I'm a introvert who doesn't drink, I don't party and I'm nothing exciting. He tells me not to worry, he is even moving cities to be closer to me. I still feel I secure and like I'm not good enough. Is there anyway I can feel better about my SOs past seed life or am I just over reacting? I've talked to him about it but he's sick of hearing about it, I have really bad depression and anxiety. He is so lovely to me, I don't want this coming between us. I know the past is the past.
<bot>: should I be upset about my SOs sexual history if he slept with countless women from different countries? He is good to me in every way but I don't feel good enough.