My computer is making sounds on it's own that sound like bowling pins being hit any idea why seriously.?

Is your computer a desktop or laptop?

If it's a desktop, it's possible that you have a case fan going out, or something could be rubbing against the fan like some wires.

It also can be a hard drive shuttering, slowly going out, or any number of other things.

I would suggest unplugging your computer power chord, and taking the case off. Then plug the power chord back in and turn on your computer. Watch and listen closely for any strange noises.

Also, check each fan and make sure they're spinning.

Take that opportunity to clean out all of the dust inside your case too. Do this with your computer off. Often dust will clog-up and stick to your fan blades.

I personally use a can of compressed air and a vacuum cleaner to get all the dust inside. Be careful while vacuuming not to actually touch anything.

Lastly, do a search for 'cleaning your computer' as I'm sure there are dozens of excellent answers about cleaning and internal computer noises here.

Good luck!

More in likely its a fan. Most computer fans use ball barrings to spin most likely you need to get a new one there easy to install though and the fans are cheap.