My fiancee' wants me to convert and become Catholic?

When I met her I was very into church (Methodist) and I had no doubt that Jesus was my savior, that God was the Almighty, etc. Since we've been dating she keeps presuring me to convert to Catholosism because she is Catholic. I have went to the Catholic church many times with her, talked to priest, and researched much about the religion. Once I found out everything that they believe I not only lost my faith in God and Jesus totally, I also became very creeped out and felt that the Catholic religion is intollerant and full of bigotry. Basically I have no more faith because of attending the Catholic church with my fiancee', but if I dont "become Catholic" apparently I can't marry her. Also even if I did (which I'm not) none of my family or friends could participate at the wedding when they have Holy Communion because none of them are Catholic either. So, what should I do? I wan't to marry this girl but basically feel "trapped" into a religion that caused me to loose my faith...