1)Its a phrase people say sometimes when they feel
sorry for you but want you to feel happy instead, usually said in a sad or singsongy way, like you want to hug the person saying it or they want to hug you
2)a)It's a phrase people say sometimes when they are being sarcastic because either they think you're feeling sorry for yourself and they think that's silly,b) they feel sorry for you
because you can't participate being too weak or didnt get good enough grades
orc) it's a sarcastic phrase meaning they think you're trying to make people feel sorry for you whether you know it or not, or whether they like it or not