Seems pretty normal to me. If a girl is attractive and goes to school/works with a bunch of guys, of course she's gonna have a lot of guy friends. In fact, pretty much the only time you'll find attractive girls without a lot of guy friends is if she works in female heavy environment like at a salon, hospital, etc. How many guy friends she has doesn't really matter, if the guys were any threat, they would've fucked her by now. What matters is how she treats you. If you're leading your relationship properly and rocking a healthy abundance mentality, you're golden.
And you're right, she's not fucking the guys and likely never will, but that doesn't stop the guys from thinking, "If I just keep working on her, THEN it'll happen." It's a sad state, but a lot of guys go down that road. Incidentally, a lot of these guy friends disappear once they find out she's in a relationship with you. I had an ex-girlfriend complain that she missed all the attention that she received from her orbiters who all took off once they found out she was with me haha.