loneliness and other teen things

Always in my like i felt like i just needed money and my dogs and i would never need a friend. Then i get older and now i'm so alone and this is so sad. Right, i have some friends but i feel like they're going away. They're with their other friends, with their boyfriends, school, and everything that can take their time.
I've feeling like this for 2 or 3 months and im pretending that's not happening but it is and it makes me sad sometimes

And it's not just loneliness, it's all that teen trash. That girl that i love and used to be my friend and now it's probably dating this guy and i can't even know if she's bc im not talking with her anymore and I DONT NEED to talk with her but my brain IS ALWAYS LIKE PLZ CALL HER.
School. Always taking 80% of my time. My grades are doing down
And u know all the rest, right? My life is a mess