if you have nothing to lose...go out there for a year. in the end at least you will look back and say you tried, rather than look back in regret because you didnt.
On the other hand, you sure all these fools be trying to get at your girl? the way you put it, seems like the guy to girl ratio is like 20:1. i mean, how many ex's can one girl have? (especially if she is just entering college) maybe this is the real issue. maybe she tells you this to get you a little jealous?
again, id be more concerned with how many ex's she has...and the image she is protraying where men/boys just cant seem to take it that she is in a relationship.