Man, you are in a bad situation. I don't mean to be rude but the truth of the matter is this.
If you get baptized.......even though you don't want to.....the rest of your life may/will be miserable if you go through with this.
I'm sure that you really love this girlfriend, but you will have a lousy and possibley short marriage if you don't really want to be a JW and she does.
Maybe because of my age, but I can easily get over a lost love and many of lifes curve balls and sucker punches these last ten years. It may hurt you deeply and for a long time, but my advice is to get out of this romance before it drains you of your love for life and all the good things and good years yet to come.
Becoming a baptized JW now will just be the beginning of you looking in the mirror and hating yourself for "caving in".
HappyDad