A DULL KNIFE IS MORE DANGEROUS THAN A SHARP ONE.Perhaps having a dull knife is why you cut yourself so often. A sharp knife is less likely to slip.
we have several of this sharpeners laying around..

They are sold at a lot of stores. Average retail value of $9.99. Carbon steel blades. This will turn the dullest knife in your drawer into a razor blade.
Hubby spent the last 6 yrs as a cook/prep cook. They have them handy because you need sharpness when you are in the culinary arts biz. For safety and precision.
http://www.northerntool.com/shop/tools/product_200151274_200151274
It takes less pressure and effort with a sharp knife. More force and pressure with a dull one.