How to stop sweat from showing through clothes while playing sports?

The other day I was playing kickball with a group of people and noticed that I got sweaty really quickly and a lot of sweat had come through the back of my shirt. (I am not overweight or anything, I just sweat easily). I did have on a thinner, tighter tank top, but it just seemed like I was still sweatier than most of the girls there (although I was one of the ones who did the most running). I live in a humid climate, so this will pretty much happen anytime I am exercising a lot outside. I'm just wondering what to do to make it where the sweat is less visible. Also, there is a really attractive guy that comes. So I am just curious if this is unattractive to guys.