Firstly, relax, you're 23! Don't get hung up on the age thing, it's just a number.
I'm a bit confused about where you are at the moment? Are you still in the 3rd year?
If you are, try to look at it from a positive perspective.
You've nearly finished! You've got this far, to quit after all that would be a shame.
Having a degree will help you in some shape or form, maybe not directly, but it's bound to be handy at some point later in life.
Also, I know you hate it, but try to flip that around, it's "only" (easy to say I know) 9 or so months of your life and whilst they might be hell, if you can pull through them then that will say a lot about yourself.
We all hate things from time to time and if you can think "**** it, I won't let it get the better of me", then that will be a great achievement. Sounds like you are just not able to focus on it?
Obviously you have to do what you want and nobody can force you to, but trying to look at things from a different perspective might help you get through it and once it's done, it's done! I know that it's easy enough to say all this on a forum and much harder in 'reality' but it's not impossible.
