How Do I Find What I Really Find Beautiful?

I feel like my head is just focus on trends. I only like things, clothes, friendships and relationships that are what is cool according to instagram. My brain is so full of these things, i can't remember what i like and how i like things to be. And trends are changing so fast, so i'm constantly trying to ful the trend, but never succeed. Ok, i hope that helped. Next question. How do i find out what i truly find beautiful?