I'm 18y having random pain all over chest left side mainly and burns but feels better right after waking then comes back my stomach seems unstable and not well feces I rarely smoke 1-2/day noteveryday?

Non specific. Since your symptoms are non specific and don't fit into one medical condition, some degree stress may be playing a role. For starters, schedule a regular health check with your physician for a basic assessment of well being and labs as indicated. In the meantime, make sure you relax by doing things you enjoy. Feel better:)