Why do my tooth feel sensitive when I touch it?!

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When the root of a tooth becomes exposed it does not have a layer of enamel like the crowns of your teeth. Instead the roots have a very soft covering called cementum, which once lost leaves the dentin of the root exposed. Overzealous brushing or using a very abrasive toothpaste can also cause abrasion of the tooth’s enamel surface and expose dentin. A very acidic diet – for example a diet with a lot of citrus food, pickles or soft drinks — can cause tooth erosion and dissolve the tooth surface, exposing the dentin. Bulimia and GERD can also result in dental erosion and sensitivity due to acid in the mouth.

http://www.colgate.ca/app/Colgate/CA/EN/…

it's probably just had alot of pressure pit on it from something before so it's a bit tender

Its prolly loosing enamel!