Dude,

I hear ya. It isn't the axe your playing or the strings etc... Yes, true tone comes from your heart, fingers, blah blah blah, etc...more like "true feel". One thing that I would suggest to you is to maybe try using a different size pick.

For example, using a heavy pick on an acoustic sounds like dirt compared to a medium or thin. You get a much more melodic, welcomed sound with a lighter pick-less punchy and much more musical sounding-(to me at least). Try messing with different size picks. See if it helps.

Also, remember to "warm up" before you actually start plucking away at notes. Strum a few chords etc... get things moving, get the blood moving, etc...

Good luck bro and don't get stressed out, everyone goes through these things. One time my ex-girl through my TS-808 tube screamer at me =)

PEACE!
-JP