Feel tight n i can breathe but ribs n back hurts n hurt touch my breast bone. im 20 n have panic attacks. do u think heart attack , bren for all day?

Unlikely: In a patient your age with no family history and a non-smoker, cardiac causes are less likely. Lung issues (such as a collapsed lung) can present with similar symptoms especially if you are short of breath. If you're breathing comfortably, and the symptoms are similar to previous panic attacks, then you could try treating as a panic attack and seek care if that is not helpful.

Not likely MI: you may have panic attack with strained muscles between ribs and costochondritis. get checked by doctor so that you can get relief.