I think you pulled a muscle and you're being paranoid. You're fine:-)
I absolutely agree with adelle. When these situations arise, you have to remind yourself of the FACTS rather than focusing on the fears. The FACT is, you know exactly what you did, and even knew what you did when you did it. It's not a mystery. The other fact is, a heart attack in a 15 year old is about impossible, not unless there is some kind of serious preexisting heart problem.
Take some Motrin, rest the area (no push ups for a few days) and when you start getting the "what if" thoughts...get out and do something...take a walk, play a game, call a friend, something.
Okay thank you!
Today it's better but my left arm still has pain randomly. I mean I don't know if that means something. But like it's at random points thro my arm. I don't think I'm having a heart attack. But it worries me that this is happening.