How to stop my over-sweating in the armpits?

So this has been happening since I was about 13 years old, and I am now 17. I'm a girl, btw. I do play sports, I play hockey, but it's not then when I'm worrying about sweating. Like when I'm at school, my armpits will start sweating really bad.. I usually never have body odour, just sweat stains... show more So this has been happening since I was about 13 years old, and I am now 17. I'm a girl, btw. I do play sports, I play hockey, but it's not then when I'm worrying about sweating. Like when I'm at school, my armpits will start sweating really bad.. I usually never have body odour, just sweat stains and it's really embarrassing. I actually avoid wearing tight tshirts because I'm afraid of the sweat stains I'll get.

I'm tried so many things also. Like using Certain-Dri, Secret Clinical Strength Antipersperants, and I've even tried using many different deoderants and antipersperants. Please help. Summer is coming, and I want to be able to wear tshirts and not sweaters, loose fitting & long sleeve shirts!
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