I need help on how to glow up😂😬

So I’m about to turn 18 and I look like a very tall 8th grader rn 😂. Like I don’t know how to wear makeup (except for doing my eyebrows and mascara), I dress in sweatshirts and jeans for the most part. I’m awkward, and lanky and I have a grossly flat butt. Can someone help?

Like tips on where to shop, how to tell what looks best on a person like me*, maybe some helpful sites or people to follow to get tips, etc.

Like I’m a complete mess. I feel really behind in everything compared to my friends. Idk maybe it’s just me being ugly 😂

* I have brown curly hair, pale, big forehead lol, 5’9, blue eyes. I might post a picture if you guys really need one.

⚠️ SUMMARY SO U DONT HAVE TO READ EVERYTHING ABOVE:

I just need help on how to look my age instead of a 14y\o by using makeup and clothes! Thanks!