Hey, Reddit. Wanted to write about something, that I have been experiencing in my life recently and ask for your advice or opinion.

Little something about me - I'm 21 male, I'm an introvert. I find it difficult to interact with new people I don't know for a long time. For the past 3 years I have been in a relationship, and to be honest - she was all I needed. I was happy. Sadly, she left me 4 months ago. My heart was broken, it still is. Only recently, I started to understand, that she is gone and I need to move on. That's the problem. I can't. I do not how to live on. I became tragically lazy, all I do is nothing. Everything reminds me of the moments we had, every song lyric we have listened to, every song with lyrics about relationships, every location we've been to, as I drive past - I remember the moments, and I sink into sadness.
I'm starting to sink into debts, I barely work (I work as an Uber driver alternative in my country), so I work when I want to - but I don't. I literally have no friends, no one to call to, no one to speak to nor ask help/advice. I understand I need to fix my life, but I can't. I do not know what to do. She was a miracle in my life for the lenght of  our relationship, but right now it feels like a curse I can't escape. Help me.