Why does it feel like something will come out when I rub my private area?

It's called ejaculation, and the more you withhold it, when it does happen it could be quite explosive and maybe a little frighting and painful, you want me to relate in a female tone, many girls suffer a lot of pain during their periods, many have had frighting experiences when they first experienced their first one. The first time I ejaculated it scared the be-jesus out of me I was in a blind panic, I'd been used to pre-ejaculation orgasms for years (they were amazing in themselves and I remember them fondly), Then this particular it all changed, I blew like a volcano all over the place, though I'd busted my penis. You can carry on what you are doing, or finally finish the task, you won't do any harm to yourself, except maybe make a little mess. The other thing that may happen if you don't is you will experience wet dreams (nocturnal emission), where you will ejaculate in your sleep, usually in having a dream, so don't be scared if you wake up one morning, and you are all wet and gooey. There is another side to this which sometimes can end up quite painful it's call blue balls, a build up of semen over a period of time without release can become quite lumpy, some are dying off and new semen are behind, apart from the swelling and pressure on the testicles and lumpy semen,which can be felt, when release dose occur, generally when masturbating is the only option, it can be quite uncomfortable, and sometimes causes a degree of pain