Most Helpful Guy
Because you are 18 and are still in your teens and older men looking at 18 year olds are kind of weird to begin with. I'm 30 and I have absolutely no desire what so ever for someone 18. There is too much of a gap in experience, age, and what each member of that relationship wants.
Just... bleh... So don't feel stressed, you are not weird. Have fun with guys around your own age. But when you get older maybe someone in their 30s will stop looking so gross and weird.
Most Helpful Girl
Because they're much older than you and are specifically interested in you because you're barely legal when they should be asking out women they're own age. These men have a messed up mentality that grosses out and creeps out many young women like yourself. Don't feel bad by being turned off by them.