my macbook pro doesnt have messages?

"im pretty sure its on moubtain lion or whatever."

Well, it is included with Mountain Lion, but not with whatever.
In a Finder window, select "Applications" directory. Then hold the "command" key as you press the 3 key. Now you have an alphabetical list. You will find Messages in the middle as you scroll down. It cannot get trashed, because you would see a message like the one below if you even try to trash it.

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https://www.flickr.com/photos/36589940@N04/22599762000/in/dateposted/

What version of OS X is currently installed on your MacBook Pro???

If close to the latest version (OS X Yosemite or OS X El Capitan) just look on the App Store (click the black Apple Icon: top left corner of any screen) or in your Finder>Applications Folder for Messages.

For more info:

Try turning it on and off

You have to update your system. Just make sure it's up to date and you should have it. Install any available updates. I had the same problem.

You are probably on Mountain Lion 10.7 you need to update it to 10.8