I feel like I'm not good enough?

I recently have been feeling so insecure and like I don't matter at all, everyone is cooler than me and I won't be cool like them, like people I'n bands are so popular and there ate people more good looking then me and I just feel like nobody knows my name and I feel so insecure around people, and feel like they matter more and I won't ever be good or cool or look good enough