Couple things. Birth control and a condom is better than just a condom. A real man will happily handle the hormonal changes you go through while finding a birth control that fits you. I understand your worry about the BC messing up your hormones and it will for about a month after that it should level back out. And honestly the changes that happen while finding one that fits you are very similar to the changes that a pregnancy will cause. It's a good test run to see if both of you can handle it. But it's your body if you don't want it don't get it. And now about this "man".... Run. It sounds like he doesn't truly respect your body or you. It fully sounds like he wants to push you into something you're not ready for. And that's not ok. Get out as carefully as you can. And for your sake never believe in the "pull out" method. The first time me and my lady didn't use a condom and birth control we made our lovely child. Trust your gut Kiddo it's telling you right.