It is normal to sweat, heck it is recommended to sweat and be cooled by it! ;D
Now if you are sweating too much, first of all, I would try one of two things. Always wear a cotton undershirt under your main clothes. Even if feel you are sweating more because of it, the cotton shirt will dispense the sweat quicker and allow you too cool better. This better evapiration of sweat will cause you less skin irritation too!
Alternative to the cotton fruit-of-the-loom type shirts, are the generic for Summer UnderArmour shirts you can get at Target or Walmart (or other stores of course). Wear that as your undershirt. (people love these shirts, they are smooth and feels like you have a hairless body; try not to get it too tight). Same benefits as the cotton shirt, but some might not like the synthetic material.
Next idea to try, if you really want to reduce sweat is use Anti-Perspirant deodorant. Though I would not recommend using Anti-Perspirant unless you truly are an extreme sweater.
I do recommend for people with 'smelly' sweat. People with smelly sweat need to reset all the bacteria that live with their skin in that area; and the dehydrating aspect of the Anti-Perspirant will help kill and rest the bacteria. (but do try to take baths to help remove the extreme bacterias too ).
Try to make the undershirts fashionable on your self if you don't to wear an extra layer of clothes. Find a way to make it your main article of clothing. Like wear the undershirt with a button-up shirt (you don't have to button the shirt!).
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Age: 27