Please dont laugh

OK so I have tried mastabation and in all honesty I must be really crap because all it makes me want to do is wee yes really wee.. iv tried in bed on the sofa in the bath and even on the toilet and all it does is make me wee.. surly this isn't right.. iv even emptied my bladder before hand but still the same out come.. I have a little leg shake when doing it then want a wee... Please help... Thank you...(learn more on Glow: