a few things to take note. firstly, get your guitar properly set up by a qualified tech. tell him how you play it (strum/fingerstyle) and he should be able to do it for you.
secondly, you must make sure you are not playing too hard. this is a common mistake when starting out. when you are nervous, you tend to play harder than necessary, causing excessive pain. try not to push yourself too hard, go gradually. i know you want to play like (insert idol name here) but go slow and if necessary with a metronome. you should make sure that you are fretting with the minimum required force.
This means that if you use any less pressure on your left hand, the strings would buzz. Furthermore, if your guitar has largeish frets (such as yamaha), fretting too hard might cause the note to go out of tune as you are "bending" it vertically.
If all that is correct, just perservere. If the pain is unbearable, rest for a while. Unless you have extreme determination, most people would be unable to practise as much with blisters on their fingers. resulting in a case of more haste, less speed.
