Sweating is good. It is your cooling mechanism. When you start riding regularly and sweating regularly, your pores will be flushed out and you will smell better. With enough riding in hot weather, you body will adapt to sweating appropriately for the heat. You may be sweating less total, but you may also find that you break into a sweat sooner as your body begins to know "the work has started. Time to sweat!" There is one thing you can do to improve comfort on those big sweat days. Start now trimming your salt. The less salt you eat on a regular basis, the less your body puts into your sweat and urine. Hence your clothes get less salty and feel better. Sweat in your eyes will sting less.

Don't go salt free right before a ride! This retraining of your body is a slow process. Takes months. But I came to dislike very salty food and food that used to need a good shake or two of salt no longer did. It was life changing. I avoided processed foods and no longer used a salt shaker. My dirty riding clothes were not salty and I was immune to the ills of low sodium on very hot and humid days, the reason I went low salt. Still had to take in potassium.

Ben