okay so i know i should see a doctor so please none of those responses...i just want an idea of what to expect before i go...

so im in my early 20s and i have these chest pains sometimes its just like squeezing on my left side sometimes its barely noticible sometimes it hurts a little bit and the pain extends down my left arm...i dont have shortness of breath but i do feel kinda weak....just list all ideas of what you think could be wrong with me keeping in mind my age...also im not at all overweight and i exercise daily...