My First Experiences

Just recently I have been feeling horny. I have discovered my clit and touch it when in bed at night. Sometimes it feels painful but if I carry on I get a gushing sensation in my stomach and have to bite my lips so my parents don't hear me. I guess this is an orgasm but I don't want to discuss it with my friends. I have a friend who is much older than me but when I touch myself I imagine us in bed together. Am I too naughty?