I've never had a boyfriend... What is wrong with me?

I'm 18 years old and I've never had a boyfriend. The furthest I've gone with a guy is literally a hug. Pathetic, I know.
I know this is really stupid but I can't help but feel so bad about it. I can't help but wonder is there something wrong with me?   
I just need to find a way to stop feeling so depressed about all this but it's like all my friends have had experience wit and there's me whose never had a guy show any interest in me. I hate feeling like the odd one out and I don't know what to do. 
Is there something about me that I should change to be more attractive to guys? 

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