Sorry, we are not able to diagnose or exam you over the inet. There are a number of reasons which can cause shortness of breath and chest pains. Only a complete medical examination by a doctor can reveal there cause.
"mama won't let me get tested"
Your mama needs to stop being a tard and take you to a doctor and/or hospital. Try discussing your concerns with a teacher you trust at school or your pastor/priest at church. They in turn might be able to convince your mama to take you to a doctor/hospital to evaluate your health. Good luck