Is this wrong to think?

I love my boyfriend. He's great, and I mean, sometimes we disagree and sometimes he treats me like a child but everybody has their ups and downs. But he treats me nice and calls me and likes to do things and go places with me, and we have fun. We've even survived a one year long-distance relationship, and we've been going out for two years. But he is my first boyfriend. And lately I have been thinking, and I don't know if I want to be stuck with one guy forever. I want to try out other guys first, especially because I am starting college in the fall. I feel like a skank for saying and thinking this, because my boyfriend is really great. I don't know what to do. Please help?