Siento algo

I am 19 yrs old and yes I am a virgin but last week when I masturbate and after i cum i feel something under on my penis like burning or something like that. Should i stop masturbating now?

Okay, how long does the burning sensation last? Does it fade quite quickly then perhaps be less in sensation for a while, then go altogether?
Or is the burning sensation there all the time?

it didn’t last long it was like only 10 seconds

What you describe is very common, in fact it may be unusual if you did not experience it
This normally occurs following ejaculation - carry on with your self-pleasuring