hi and welcome to androidforums!
on my samsung galaxy s3, i hit menu > settings > language and input > press the settings button for your keyboard (mine says "android keyboard asop") > then there is an entry for auto correction and select off
hope this helps, not sure what phone you have so it might be slightly different. feel free to join our site so you can chat with us in real time which might be of more help, or go ahead and resubmit another question with more info such as your phone model, version of android, etc