Go on youtube and type in random songs that you like, but think would be hard to play. Thats proof that anyone can play anything on guitar if they work at it enough. Its gonna piss you off watchin em, but it motivates me. For example, that little kid playing Bron Yr Aur (thats like the 543rd time I've mentioned that song in the past 3 days) motivated me to learn it. After the first night playing it at half time, I've almost got it up to speed.

So sit down and learn. And Aschelman is right, you learn from others material. Thats where influence comes from.