Why do guys never flirt with me or ask me out?

I’m 20, in college and I almost never get hit on like my friends do. When I go out with friends guys hit on them, call them hot... but they never compliment me. This applies to events on and off campus that we attend.

Im not desperate for guys to hit on me but it makes me wonder if no guys ask me out or compliment my looks, it must mean I’m not as attractive as my friends right?

How can I make myself more attractive to guys so that they ask me out or notice me, especially when I’m surrounded by other girls? Any advice is appreciated!

here's a pic of me, Im on the left:

Why do guys never flirt with me or Ask me out?
Why do guys never flirt with me or ask me out?
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