My first relationship was with a self centered girl who would guilt trip and insult me just enough for me to forgive her till the next time. If I could go back in time and warn myself, I wouldn't. The experience helped me understand myself, and gave me the confidence that I can handle relationships with actually somewhat reasonable people.
It's a new experience, so of course you are nervous, but that does not indicate if the experience is for you. Do it and find out.