Negative thoughts about how I look :(

Before I go out I always worry about what people will think of my clothes. I always had this problem but years ago I didn't care, but as I get older these thoughts have gotten worse.

I have low self esteem when it comes to my body and appearance. I love fashion and looking good. Some days I just want to wear what I want but I fear that people will mock me and my day will be ruined. I don't want to seek validation from nobody but unfortunately when I don't get attention I feel like no guy will ever like me. I'm so used to getting positive attention when I dress because people like my fashion sense. When I don't I get upset thinking I'm too skinny, I look like a child etc this is all from horrible comments made by some guys. I try and tell myself that no one cares they are caught up in their own selves. It's like I have a negative feedback loop in my head and I want it to stop and go back to how I was doing in the past.