How to start again, Re entering the Christian faith?

Well over the last two weeks I've been going out with this girl and she's Christian and I'm sure all of u know how that's supposibliy works out since I am not officially Christian, Before I was with her I was like a sinning machine, I took the lords name in vain so many time and I did so many things that can be considered sins but while Ive been with her over the last 6 months or so and getting to know her I wanna give up on this, I wanna go back to the way I was in 5th grade when I prayed before bed and thanked god for things and went to church, Im not doing this to be with her it's just recently that someone brought that to her attention and she says she isn't going anywhere and i believe her but when I think about it I could drag her down and that's something I don't wanna do and while I thought about that I had a few thoughts of how much mor secure I used to feel when I did all those things but now everymorning I feel like crap so last night I made a decision I'm going to start going to church again and Im going to go get a new bible and start reading it, Last night I decided to Start by taking an hour to pray before I went to bed, I asked for forgiveness on alot of things and asked for some guidance because I really do think I'm on a bad road and maybe she's the one who's supposed to set me straight, So I woke up this morning and felt amazing I haven't had any trouble once or had a problem doing anything that people asked me and I even started reading the bible at lunch and it didn't frustrate Me as usual, I had a dream about my grandmother last night and she was talking to me and telling me something about coming to see her and she's been dead since i was around 6 or 7 and she was the one who used to go to church with me every Sunday and taught me to pray and everything so what do you guys think? Me personally I believe that it was a sign that it's time for me to find my way back into christianity so that I can find my way to a good afterlife rather than the path I was on that was leading to a eternity in hell. So can I get some opinions on all of this and possibly some help on how I can keep on this path and not go astray again.