Is it ok to stick something up your vagina?

It is perfectly normal for you to experiment sexually by playing with your genital area. If you're going to insert anything in your vagina, it should be clean, smooth and unlikely to get "lost" up there. You should also use a lubricant such as glycerine-based jelly (KY) or Astroglide.
A "dildo" is an object specifically designed to be inserted into the vagina for sexual stimulation. Dildoes have been found by archaeologists which date back many thousands of years, so this isn't a new idea.
Some people insert food items into their vaginas, such as cucumbers or pickles, carrots, hot dogs or other sausages. I recommend that you do not do this. If you decide that you want to anyway, I highly recommend that you cover your improvised toys with a condom. Tying the condom shut also gives you a handle for retrieving the toy if it goes in farther than you want.
If you have access to an adult bookstore or can order online, I highly recommend you pick out a real actual dildo and use that. Expect to try several kinds before you find one you're really satisfied with. Keep them clean, and store them in a private place. Websites like blowfish dot com and goodvibrations dot com are sex-positive, female oriented webstores which can help you find good toys, lubricants and advice on exploring your sexuality.
Masturbation with a toy or with just your fingers is a perfectly normal and natural way of learning about your body and about your sexual feelings and desires. Don't be afraid to experiment, but keep it safe, sane and consensual.

http://en.wikipedia.org/wiki/List_of_banana_and_plantain_diseases

I'm only 13 so it is impossible to order/buy a dildo or sex toy in my area. I have been masturbating my whole life, and to tell the truth my fingers are nice, but I need something else. I just started using smooth, clean objects (candles, hair brush, curling iron) to penetrate myself. If clitoral stimulation is more your thing, I've used electric toothbrushes, electric shavers, water from a faucet or shower head. So even if your shy about buying one or can't buy one, there are ways to experiment discreetly. Just make sure it is very clean and very smooth, oh and use some lubey if needed (it helps with the bigger things you put inside you) spit can work, but a lil extra virgin olive oil is way better.

sure if its my cock. If it feels good - stick away!!!

Well that's the vagina's job, not to put too fine a point on it. Make sure it's clean, has no sharp bits and you can get it out again.

Little girls sticking dirty things in their vagina is the cause of cervical cancer...
Most people don't have a clue about germs...
In triple-X websites I see babes with just about anything stuck up their vag's.. In one pix a babe has a banana in her hole... I doubt she sterilized it before masturbating with it... That rough flower end of the banana would scratch her tissues, and infect her with a few hundred different types of parasites... Make sure the thing you masturbate with is sterile...

If it feels good than I guess so.......I wouldn't kno I'm not a woman.....

Yeah
Where do you think we come from?

Depends, if its a penis then yeah. If its a dildo or some sex toy then yeah. If its a thrasher then no.

No, it should be sewn closed.