My boyfriend is worried about the man I will eventually marry.

I'm a 20-year-old woman, and my boyfriend, also 20, and I have been in a relationship for 14 months. Last night, we had a conversation about my plans for my body once I have more money. I mentioned that I want to get laser hair removal first and then a female vasectomy. He asked if I was serious, and I explained that while I want to have kids someday, I prefer to adopt. The thought of being pregnant really scares me, and I don't think I ever want to experience it. I also mentioned that while my feelings could change, I feel firm about my decision for now. He expressed that he wants us to have a biological child together. I was surprised and pointed out that he seems uncertain about marrying me. He said that if we were to marry, we could have kids together. I explained to him that pregnancy involves not just having a child, but also physical pain, postpartum depression, and more. He responded by saying that pain is something I would have to endure, and he would be there to support me emotionally and mentally. This annoyed me, and I decided to end the conversation. Today, he brought the topic up again, and I told him I didn’t want to discuss it because I didn't feel he would understand. He insisted on talking about it and criticized me for being "immature" for making this decision for myself, claiming I'm too young to figure this out. He accused me of being selfish for viewing pregnancy as painful and not considering how he feels about having a child. He said I come off as narcissistic for only thinking about my own feelings. I asked why he couldn't accept that it's my body and my choice, regardless of age. He argued that in marriage everything would be shared, and nothing would belong solely to me or him. I told him that if that’s his perspective, he might need to rethink it; otherwise, I'd be concerned about my potential future as his wife. I also mentioned that if I couldn't find someone who thinks like me, I’d be better off alone. He then accused me of being ready to leave this relationship for someone else and said he was genuinely worried about my future husband. So, am I in the wrong here? **TL;DR:** My boyfriend believes I'm immature for not wanting to get pregnant and wanting to adopt instead. He thinks I'm selfish and too young to make this decision for myself. Am I wrong for feeling this way?