How do I counter people who are really aggresive?

I’ve played a few players who just charge in constantly, i’ve tried advanced guard to push them away but the second I do that they jump straight back in and smack me with a high priority attack (Chun Lis rapid kicks).

My understanding of this game is pretty poor, the way i’m playing at the moment it seems me and my opponents are just taking turns at jumping in, or jumping in at the same time and the higher priority attack winning.

I’ve found all the combos I need, but nothing that has actually explained how to play the game.

Welcome to SRK! Please look into the strategy thread. Also, read the forum rules. =)