My chest feels tight, no pain, and i think i have avid reflux. it got better last night but it's still happening today. is that a problem?

It is often: challenging to sort out chest issues. Chest tightness in a 22 year old woman may be related to asthma, GI problems like reflux, heart issues, etc. It actually would be unusual for acid reflux to cause tightness without any pain/burning discomfort. This requires collecting a careful history about frequency, intensity, character, aggravating factors, etc. See you doctor for the necessary eval:)

Depends: Chest tightness can be a symptom of heart disease but may be may other things such as aortic problems, respiratory disorders (asthma, COPD, bronchitis, lung collapse, infections), esophageal spasms, and muscle problems to name a few. It really depends on the clinical situation and other symptoms you may be having. Depending on the duration it would be worth seeing a doctor.