Hey dude , it is possible u are doing it a little too hard or maybe possible too much. But its pretty normal for it to have a bit of burning sensation at the tip. I experience that to sometimes. Try taking a day or two off and next time not so hard ;)
If you've never had sex you don't have an STD. You don't say where the burning sensation comes from. If it's from the surface of your penis, you're doing it too hard. If it's coming from inside - your urethra - then you may have urethritis for one of a few non-sexual reasons. Speak to your doctor if it persists or you feel discomfort whilst urinating.
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