don’t know how to deal?

I know looks don’t matter but fuck it gets me down, I go through Instagram and see countless girls who I don’t compare to what so ever I try to look at my good qualities and remember looks don’t matter at all but it still gets to me and makes me insanely down, I know that jealousy is bad but I just can’t stop comparing myself, I can’t believe anyone. When they tell me any different because it’s facts in my head you know? It’s just a fact to me that so many other girls are so much better then me, I try not going on Instagram what so ever and stuff but something always seems to pop up or I end up going back because even tho I’m not looking it’s just a fact that I don’t add up, any help with how to make myself feel better ? I don’t even know why I care this stuff doesn’t even matter get it gets to me so much, do I just not meet my own expectations ? I don’t like it when people tell me to lower them because that’s just admitting I’m not good enough