Don't think of yourself as a grown-up, think of yourself as a kid.
Nothing is so all-important that you can't laugh at your process of learning. Every mistake is just a small tumble, but you can get right back up. Every time you're upset, it's a cry for help but know that you'll feel better again soon.
Know also that the help is there from:
Family
Friends
even strangers.
From the whole world and from yourself.
Don't forget that you can help yourself too.
Look outside and look inside. (Always check both!)