Comparing yourself to people that have 8 years of experience is silly.

Think about this: You go to a school to learn about music, but you don't actually learn any instrument, just music theory. You then pick up a guitar for 3 months and go play in a club. Dave Mustaine (Megadeth) walks in and shreds it. You feel depressed.

Makes no sense right? Don't give up, but realize that it's going to take more than 3 months of practice to be good at this (or just about anything really).