Im worried about my looks and also health and I seek advice on how I can improve

Hey guys, im 19 (M) and I’ve always been very obsessive/insecure about my looks, im seeking advice on how I can feel better about myself and how I could even improve how I look and how my body feels. To be honest, my body feels like shit everyday.
Im pretty skinny but im toned and it doesn’t look all that bad, and I would also say that maybe my looks aren’t so bad because I tend to get laid rather easily off dating apps and such with attractive women. The point is that I don’t get it, sure it’s good I still get laid but “I” myself wants to feel good and I just don’t. I feel like I am ugly and im not sure what I am missing, I don’t think I’m conventionally attractive but somehow others see it? I want to feel good about myself; (how I look and feel) but I always tend to crawl back into the thoughts that I’m not attractive. I guess some insight on what I feel inadequate about is the recession of my chin, my jaw isn’t the most defined, my cheeks are a bit chubby for some reason even tho I am skinny, I am very pale and pasty, my eyes are droopy and puffy, my nose is large, crooked, hooked, and downturned, and my skin is oily and I have breakouts pretty bad sometimes mostly on my neck after shaving, I have pretty bad eczema on parts of my face and scalp which causes bad dandruff, redness, and flakiness.
Any advice on how I can better my health and looks? I can’t keep living like this and I know that it just won’t be good for my mental in the long run. Any Help?