You have to practice and forget about how fast you are going,without accuracy speed is nothing but noisy and unpleasent to listen to. ALWAYS use a metrenome or drum machine because again speed without accurate timing is nothing but noise, learn and memorize as many scales as you can and keep at them , start slow and work your way up but most importantly make each note ring loud and clear, even if it means one note per bar, you will begin to speed up naturely because your finger muscle's will remember automatically, and remember that nothing in it's nature is difficult to do as long as you take the correct approach to it and learn how to do it slowly and clearly, it will begin to be part of your nature. Music comes from within through our hands to the strings to our ears, and if one doesn't know the path from A to B to C to D how will you ever get there.And most importantly know and understand each note and where it is on the fret board, teach yourself to know them by ear and sight, do not always pick up your guitar to make music, try and read tab or notation and picture the notes in your mind and hear them in your head before it ever comes out of any sound hole. Oh yeah PRACTICE PRACTICE PRACTICE!!!!!!!!!