I definitely wrote some right crap when I was younger. Maybe I still do but I'm not published so I'll have to wait to find that out. ^^
So if I could give any advice to my younger writer self this would probably be it.
1) Flaw those characters!
2) Please stop describing every character's appearance as soon as they say something.
3) Go look up an author called Stephen King. Also buy his book called On Writing. When you're 23 you're going to want to have wished you had these tips ages ago.
4) You're very afraid of killing your darlings at this point. I know you love them but get some writer balls and do it. You're writing horror anyway. It's a very unforgiving and merciless genre.
If you could give your younger writer self any advice what would it be?