Girlfriend want's to wait till marriage for .?

Me and my girlfriend have been going out for about 4 months now. We have discussed the issue of and she said she wants to wait till marriage for any type of . We are only 16. Im not asking for now but maybe in a year or 2. i know i'm to young now and i kow myself that i am not ready for , although i wouldnt mind taking it a step further onto oral. Anyways if we were to wait till marriage then that would be in like 6 years or so and i really don't think i can hold out that long. I hae been offered a couple of times my some people i know and i have declined them all due to the fact that i have a girlfriend and i live her. If i continue to get these offers when I go off to college i don't know if i coud resist or not. Any suggestions?