Don't worry about being bad. If you already know the combos and block strings and what moves are generally good to use just use them when it feels right and go from there. Try different things and see what works.
Try not to think of it as making what you do good as much as making what you think your opponent is going to do bad. For example if you think your opponent is going to mash 2a, counter-hit it. If you think your opponent is going to do a dp/ex, bait and punish it.