Young relations

No one ever talks about this. For a teen girl in the process of trying to start her post secondary life, no one talks about how relationships play a huge role on mental health. Like In my mind I can’t go a day with out talking to him. He’s my only source of happiness. This isn’t healthy to live like but I can’t help it. I have severe attachment issues and codependency and some might say I have daddy issues. But I feel like as a 17 year old girl I should be doing something with myself rather than fawning over him 24/7 how do I find happiness within myself and not care if he moved on ? What should I be doing in LIFE? I have no guidance and no positive role models . What do I do, I’m tired of living like this.