Why do my friends compliment each other but not me?

Anonymous
I've noticed some of them often compliment each other. One of my friend does it because she's kinda in awe of another friend. But they also compliment girls that aren't pretty and don't dress well but who always talk about themselves. I sometimes compliment them, and it's always sincere but they never do.

I don't need to be complimented by my friends, but the fact they compliment each other but never me is a little hurtful. Do they consider myself as ugly?

Paradoxically, guys tend to check me out a lot, stare at me, sometimes I heard them saying I'm hot as I walk past them, some guys even tried to approach me. But my friends, those who compliment each other, they are never checked out, no boys approach them (I hang out with them all the time), except one of my friends who is really pretty.

Why do my friends compliment each other but not me? Why do they compliment even girls that aren't pretty at all?
Also, if my friends don't compliment me, why do guys act like this with me?
Why do my friends compliment each other but not me?
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