Sweat problem!! how can i prevent it and make it disappear?

My school forces us to wear a certain selection of cloths and i find the one that fits me most is a kinda see-through shirt, so i usually wear a t-shirt under. But I've got this sweating problem and so the sweat goes through the t-shirt (leaving it's yellow stain) and to my shirt which now has a yellow stain too. I've used Speed Stick, Degree, Axe and now using Gillette. I know that I've got to use anti-persperient deodorant. My mom was able to almost completely wash off the yellow stain from my old shits but after a while, it keeps coming back. How do i prevent it and make it disappear completely?