I'm not sure what it is, but the track just has no forward motion to it, it seems to just be plodding along. I'm sure it's something to do with the drum/backing track, it just isn't that groovy.

That aside, your guitar playing is nice and clean, could do with more vibrato in some bits though.

I use FL studio too and getting a really groovy backing track with it takes some effort. I've been making drum beats with a bit of shuffle recently (instant groovyness! sorta)