Wierd smell under my ? 10 points for best answer.?

ok. I am 5"7 and a 38E i live in texas. during the summer tempratures can rise to over 100 degrees. I am in this kickboxing program and its outside. so retarded. Last summer after kick boxing practice and all those hits in the face punches and kicks to the stomach and other places. I usually take the bus home bu i decided to jog to stay in shape. I live 4 miles from the outdoors dojo. So when i got home i was hot, tired and exausted. when i looked at my chest it was wet all over under my s. It was really wierd and embarrasing. when i took off my shirt i smelled some type of vinegar or smelly feet smell.i tryed washing my bra and using baby powder (please dont mention these in the answers) at the dojo the other fighters tell me that it stinks.Do your smell like that plse help me .