It sounds like, to me, that you need to see a Doctor and have a check up. That is why Doctors are called professionals. First you have to make sure you are not experiencing anxiety
attacks or indigestion
problems (heart burn). They feel exactly like heart pains. You are a valuable person and each life is a treasure. It does not take courage to kill yourself and once you are dead, that's it. After you are gone, no one will care and most will NOT remember you.
It takes courage to live. Make yourself happy, do things that you like. If other people see you having fun, they will want to get to know you and will want to know, how do you do it?
As for me I want to be around for a long time and make sure everyone remembers me.