I need help really bad

I’m 15 and for as long as I can remember I haven’t felt like real. It’s really hard to explain but it’s horrible. It’s like watching someone live my life. I feel like it’s getting worse and I have no idea how to stop it. I’ve tried multiple ways I’ve seen online and it hasn’t done a thing. Please can someone help me I hate this so much I don’t want to live like this anymore. Thank you 🙏