Do not convert just to marry her. DO NOT BE FOUL!I converted myself after 12 years of marriege with moslem man. He did not ask me to do that just for him, he gave me freedom to choose BECAUSE it's writtten in the Quran that Religion is a freedom, you are free to choose.I choosed to change by myself by practising, ISLAM is just a relation with your GOD (between you and HIM), it is not a document. You should change after reading and deep thinking.
At the moment You must be happy to share the life with her for what you are and not for what you should be. BE ALWAYS YOURSELF AND BE PROUD , NONE SHOULD FORCE YOU EXPECIALLY HER (IF SHE LOVES YOU ).GOOD LUCK.