I am too intimidating and aggressive, and mean? Is that why guys don't like me?

[Gapgirl]

So I am 19 and I have never been on a date or have had a boyfriend. I am fine with it but I think its my own fault. Other than my ambitiousness in school, I try hard at being social and witty. But, I guess sometimes I'm too aggressive or mean? For example, I was hanging with my friend and her visiting guy friend. Our floormate walks by and asks if we have milk. We tell him no. My friend asks why he is always asking for milk and I say "maybe he wants to grow." I said this in a neutral, non mean way because thats what I honestly think is why he wants milk. Everyone else thought it was mean but I said that those were his exact words that he wanted to drink milk to grow because he's short! The guy friend just said "that's messed up," ( in regards to what I said). Am I too rude or mean? Is that way guys don't even like me? Sometimes I feel like I am too intimidating since I graduated valedictorian and hope to do male dominated jobs. I bust my butt in college but I want to know whats wrong with me, socially. PLEASE HELP