Why don't guys ever see me as girlfriend material?

I've just graduated college, and looking back on my romantic past during my time there, it sucked. Guys never wanted to date me, just hook up/be friends with benefits. I have a good double major (economics and math), with good grades, I have goals, I have hobbies, and I didn't sleep with guys "too soon." Yet they would always end up saying "I don't want anything serious..." and then they'd go and get serious with the next girl to come along. I'm at the point now where I'm just thinking "What the f**k is wrong with me?" Why is every other girl deserving of love and commitment and I'm not?
Why don't guys ever see me as girlfriend material?
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