Sharp Pain In Chest When Breathing?

Occasionally, I get a sharp pain when breathing or coughing for a few minutes, the pain worsening as I breathe deeper or cough harder. Also, for the past few months I've found myself having to run to the bathroom to poop/have diarrhea every time I get nervous, scared, or embarassed (which is a lot) Just today, I've gotten a sharp pain in the middle of my back when I'm bending or tilting my body.

INFO ABOUT ME:

Age: 12
Grade: 7
Activities: Dance Class
Shared: I only told my best friend and she said it was a chest cold....... I didn't tell my parents yet because I don't want them to worry.

I'm really worried it's cancer or asthma or something of that nature but none of my relatives ever had anything like that... HELP! D:
 
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