Okay, so it's already been one year since I picked up the guitar.

I know
all the major and minor chords.
I know how to
palm mute strings and chords,
how to do an Appregio,
chord picking,
I can do quick changes,
I can tap, bend, trill, hammer-on, pull-off

But somehow I feel that something in my playing is missing. I just can't figure out what.
So that's why I decided to start from the beginning.

But I don't know where to start. So ... can you guys help me? ^_^
Learn the songs you like, improvise solos over them, join a band, whatever you can think of to keep you playing.
keep learning lots of songs that you like and start getting more into theory and learn scales and stuff.
"There he goes. One of God's own prototypes. Some kind of high powered mutant never even considered for mass production. Too weird to live, and too rare to die."-Duke
I won't give the typical "learn theory and scales" stuff, that stuff is important to learn but just play so you're enjoying it and don't make it a chore. Don't "start from the beginning" everything you learn is valuable really.
Open your minds and shut your mouths.