Hi there. Why don't you trying doing push-ups from a different approach, starting at the bottom of the motion - so to speak. Once you stabilize yourself at the "bottom" (chest as close to the floor without touching, arms bent) of the push-up...hold this position for as long as you can. Your arms will start to shake like crazy after only a few seconds (because your body is not used to holding this position) your abs may even start to feel the burn. But if you keep repeating this for maybe a few weeks you may strenghten your muscles enough to complete a full push-up(s) all the way up and down. Give it a try, it can't hurt.