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Shoop for starters
Read all sorts of skincare & makeup guides
Practice self care by doing your eyebrows weekly, always having your nails painted or done, condition your hair regularly, moisturize your face twice a day and body everytime you shower, always wear a light perfume, exercise and cut out food high in sugar and drink 2 liters of water a day
One thing that makes people look beautiful on the internet is honestly being interesting. I'm not saying "ooh ur inside needs to be beautiful not ur outside" I'm saying, look how much lolcow tears into people who just stare vapidly at their cameras and shoop themselves into aliens. No one envies that.
Find hobbies, if you take a beautiful photo of yourself reading a book, watching the sunset, finishing a bike ride, painting a picture, you will look so much more beautiful than someone who rolls around on the floor trying to find the perfect angle and lighting.
lol i sound like a neckbeard but I'm actually just a woman who went through exactly the kind of painful envy you did. I feel a million times more attractive now that I can do makeup well, bathe regularly (I was gross), have good skin and have lost 20 pounds- but what really made me feel better about myself was finding shit about what I enjoyed and who I was.
I'm an artist and as soon as I put my all into painting, I felt better about myself. I took better care of myself because I had an identity to care about.
Obviously, art's not for everyone, but make sure you've got something you're passionate about OP, otherwise you're decorating an empty shell and that's not exactly motivating.
Also, diverging from that, make sure you have routines(diet/hygine/skincare/exercise). Consistency is the only thing that improves appearance.