Assalamalikum Wr Wb, I just wanted to ask if running away from home is a sin? Will Allaah (SWT) get mad?

Alhamdu Lillah

Dutifulness toward parents in Islam comes directly after worshipping Allah SWT. Leaving your house will definitely aggravate your parents and makes them worried about you. Running away without their permission for no legitimate reason is one of the major sins that you should not even think about!