Is it normal to blush, turn red and sweat this much?

As far back as I can remember, whenever I am talking to more than one person (strangers) I turn red and begin to sweat. I don't feel anxious when I start talking. But after about a minute or two, I feel my face begin to burn up and a little sweat starts forming on my forehead. I can tell people notice because they tend to do a 'I am not noticing that you're turning red' smile. It happens everywhere, at the grocery store, a nightclub, asking a group of people for directions in a new city- you name it. At my job, I hate doing presentations because I know I am going to turn red and start sweating. This even happens with my coworkers. For the record, I am not scared that pople will think I am not presenting well. I am also not really shy. I recently went through a break up (after 7 years) and have had a pretty easy time getting back in the saddle. It's just this damn turning red thing. I try not to think about it, but after several minute of talking with a group of people, I'm sweating and beet red!