Both of you will have to change things about yourself, and make compromises that will mean you don’t always get to do or have things exactly as you want.
People always say things like „be true to yourself – if he loves you he’ll accept you as you are“, except the way you conduct yourself when you are single is different to how you conduct yourself when you are in a relationship. If you live together and you say you’re going out for a few drinks but then get wasted and don’t come home until morning without a call or text, then you’re a bit of a shit partner.