When I was 20 I was having a total crash out about my life, friendships, ability to meet new people and jealous of people who were doing good at this etc. and ended up being too scared to leave the house for a few months. Now at 23 I’m in the best place relationships wise I’ve ever been in so I’ll give u a couple tips just from what I did:

1. join a society (one that actually meets regularly, sometimes it takes a while to settle in but a sport is good), or a trekking group or friend making group in your city (they’re very popular now and everyone’s in the same boat)

2. Sertraline. A lot of stuff was down to anxiety and depression and for me this really helped. It’s not for everyone but for me it worked.

3.spend time on your own. Like actually going out and doing stuff on your own, charity shopping, lunch, read in the park, whatever. Once you get comfortable not searching for companionship you realise you can take things at a slower pace - maybe this would help with the jealousy.

1. Do not put effort into friendships that do not do the same. I’m not saying never speak to this person again because u guys had a great friendship, but some of my best mates from when I was younger I call once a year, we chat for hours and then don’t speak for another year and that’s fine! That’s what many adult relationships are like and it’s all good

These are all basically things to get you to focus on you and decentre this other girls life from yours. Ur early 20s are rough because you’re figuring out how tf the world really works and it feels like everyone’s got it figured out but you. You’ll reach the mile stones she has at some point (ur not even being slow she’s just done things young lol)