Self confidence

I am from the uk, and where I live is so heavily social media based. I don’t really upload much or that I kinda drifted off the radar, but lately I’ve been feeling so upset and insecure. These girls look flawless, makeup..expensive clothes..nice bodies. And I know all these things aren’t realistic and the extremes they’d go to get these bodies are too much for me. But what I’m asking is how could I overcome this feeling, it’s almost jealousy. Like why am I not as skinny as you? Why does my makeup not look as good despite me having good makeup! It seems like if you don’t have a hour glass figure or similar then your not as accepted, but I have a rectangle figure and if you turn me to the side I resemble a muffin!! I want to lose weight but at the same time just want to accept the skin I am in. I know there are people who are worse off than me..worried about a lot more than a bit of belly fat..does anyone know anything that they’ve done to help this or just general advice. This has really got me down in the dumps 😔