haiggy I don't want to scare you or anything but when I was about 16/17 years old I was asked by my then girlfriend to "...accept God and Christianity into your heart or burn in hell." That one phrase ended our relationship right there. I simply said "If that's what you think, I'd rather burn in hell." and walked out the door. (one of the attributing factors in my Agnostism <-if that's a word)
People only change because they want to, push too much and bad things happen... but I bet you know that. Your parents are trying to guide you but may not understand that faith doesn't mean compatibility, and doesn't stop love.
Your family (maybe you too) needs to realize you're 17! While it's nice to think that you will get married to this girl, you both will have a lot of 'growth experinces' in the next 5 to 7 years! Focus on the short term and let the long term figure itself out.
As an example, I know a jewish guy who was dating a christian (non-catholic) girl. His family threw a fit when they found out (apparently Judisim is passed to the child by the mother) and refused to support the relationship. When they got engaged the family turned up the pressure on the girlfriend to leave or convert. Eventually she cracked and handed back the ring to my buddy. That night he told her that it didn't matter what religion she was, but that she believed in the two of them and put the ring back on her finger. The parents backed off and about a year later she told him that she wanted to convert! She said the lack of pressure gave her time to think for herself and she wanted to go through the process on her own volition. They've now been married for 4 years with one kid and another on the way. While religion is a part of their lives, my buddy still thinks they'd be as happily married today if she did not convert, because they're still the same people underneath the labels.
Now forget about all this and just have a good time with your girlfriend!

People only change because they want to, push too much and bad things happen... but I bet you know that. Your parents are trying to guide you but may not understand that faith doesn't mean compatibility, and doesn't stop love.
Your family (maybe you too) needs to realize you're 17! While it's nice to think that you will get married to this girl, you both will have a lot of 'growth experinces' in the next 5 to 7 years! Focus on the short term and let the long term figure itself out.
As an example, I know a jewish guy who was dating a christian (non-catholic) girl. His family threw a fit when they found out (apparently Judisim is passed to the child by the mother) and refused to support the relationship. When they got engaged the family turned up the pressure on the girlfriend to leave or convert. Eventually she cracked and handed back the ring to my buddy. That night he told her that it didn't matter what religion she was, but that she believed in the two of them and put the ring back on her finger. The parents backed off and about a year later she told him that she wanted to convert! She said the lack of pressure gave her time to think for herself and she wanted to go through the process on her own volition. They've now been married for 4 years with one kid and another on the way. While religion is a part of their lives, my buddy still thinks they'd be as happily married today if she did not convert, because they're still the same people underneath the labels.
Now forget about all this and just have a good time with your girlfriend!