My keyboard is not responsive unless I hit the keys very hard. Its making me crazy. My "m" key isnt working unless I really continue to hit it hard.

Hitting it hard ( and I can understand your frustration), will not help the keyboard problem.
I think you have a fault in the keyboard connector lead. The best way is to replace the keyboard with a new one or good 2nd hand one ( ebay is a good starting point). You can also prise off the offending key and clean underneath, however, this is a very delicate task.

The other solution ( and I'm going to get flack from the purists for suggesting it), is to remove the keyboard and wash it in warm soapy water, rinse it and let it dry THOROUGHLY" for 24 hours, this gets muck out from under the keys and works well if you spill coffee etc on the keyboard.

Distilled water for the rinse is best

I don't guarantee the above, but if you need to replace the keyboard, you have nothing to lose