I don't necessarily know if this is a thought or a wish of yours, but if you do want to die, i would suggest seeking professional advice for this
You deserve to have a life you want to live!
I can understand your fear...I think we've all thought about staying young forever...but if you die young, you won't necessarily continue living as a young person forever, but you will be a young person who is dead. Once you are dead, you can't really be happy about you never growing old...for obvious reasons love...
You deserve to live so that you can one day be happy about the life you have. We all are the person holding ourselves back from progress, and let's be honest, anxiety sucks and is hard to conquer!
But you can conquer it. Will it be some kind of work? Yes, and will you have good days and bad days of anxiety? Of course
But you can one day have the life that you want, if you work at it.
Please be nice to yourself. We all "whine" about our lives at some point, especially me! Real progress can't be seen after a few times, it can be seen after being repeated over and over and over again. So you may not see it, but your efforts now will all add up to something big later, trust me.
Please be safe! If times ever get bad, here is a website: http://www.suicidehotlines.com/
The "anxiety techniques" sticky thread is really helpful too for approaching anxiety-inducing situations! Best of luck to you