newbie question about pushups

about 2+ days ago i did about 50 pushups or so, it might not sound like much but for me its the most ive done, i kept going until i couldnt do them any longer.
my question is, two days later, i have no chest pains, no arm pains, but if i touch my back under my shoulder blades i get this real bad pain. i dont know what theyre called. but is this supposed to be an affected muscle when you do pushups or is my body telling me i am doing them wrong? also, what else do pushups work on?
 
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push ups do mostly chest and shoulders. i started doin em for my pecs, cuz thats what my friend told me, but my shoulders are real nice now, heh. anyway they do some arm but not much. and i dont think ur doing muchw rong.
 
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