I take everything way to personally?

I have alot of friends and a boyfriend, and i get complimented alot and alot of guys find me attractivee. But one day, two very immature guys said "Ewww!" and made disgusted faces at me when I sat down at a table. They did for about 3minutes, and it kinda hurt my feelings. These two guys aren't too popular, and they aren't really liked by many people. How do I learn to not let stuff bother me and stop taking stuff so personally?