How do you know your doing gods will?

I am at a job right now that I cant stand!! I have been here for over a year and I know that god has told me to sit still and wait. Well the opportunity for me to go to school has come up and I want to do Gods will. Because I want this so bad and don't want to hear no I am worried that I might not be doing his will but my own. I cant shake the felling that I might be being alittle impulsive as I have in the past and I really cant afford to just blow money. If it isn't gods will I must admit that I am not going to be happy is that wrong of me? I am also to scared to ask for a sign cause I don't want to hear no. I feel peace about going back to school but than again I hope its not just me.