I think the point you are at is the point every casual guitar player encounters. Its like ok I can play these few songs but I really am not a guitar player and this is very frustrating.
I was at that point forever. I grew up just kind of grabbing a guitar when I was about 16 and just basically trying to do what my older friends could do......Fwiw I never could!!!!
I wanted to play guitar to play the stuff I liked, the eric clapton unplugged album, anything van halen, anything bon jovi...pearl jam...
so that is all I ever tried to do, find guitar tab books and just keep trying to make this happen. Somethings I could play and some was just too hard and frustrating and made me put it down and walk away.
so with it being just a hobby I never really sat down to learn the stuff I should have been learning. Instead of staring at the clapton unplugged book or van halen guitar tab book all day I should have been learning about what was going on.
so in 03 when I moved to Texas and basically had time to do this, I tried to figure out what to learn but even that became a large task I couldnt quite get sound instruction on.
Then I found this dudes website, Dan Smith.
http://scenicnewengland.net/guitar/index.html
Changed everything.
Instead of just trying to learn the guitar parts of the song, it helped me understand the song and even the tab better.
So I went through and printed out all his stuff.
I started with his music theory lessons.
http://scenicnewengland.net/guitar/chords/chords.htm
this was incredibly helpful and gave me something else to do with the guitar instead of playing living on a prayer again! It is very useful especially the circle of fifths.
then I moved on to printing out and digging into his guitar scale lessons.
http://scenicnewengland.net/guitar/scales/index.html
this is awesome, learning all about keys, scales, modes etc.....its like going to college.
I am unhappy to report, life got in the way on me right when my guitar playing was at its best. I only mean that as a joke, I had my son a few months after having discovered all this. Also at that same time I realized that i wanted to work in tv production on some level and had to start down that road.
So my guitar playing basically came to an end. If I even try to take a guitar out and play it right now my kids are on me wanting to play it in seconds! when they get a little bigger I will get back into it, all of these lessons is where I will begin again.
learning all of this vital stuff and just simply playing stuff is a great way to learn. After a few months of sitting down and understanding the modes and keys and just practicing, I went back to some guitar tabs. There is a great program called powertab
http://power-tab.net/ I dont even know if you can download the software anymore. But it is great, especially for learning. It is the tab to songs and then it also plays the song so you can hear how things sound broken up note by note.
So I took some of the songs I wanted to learn and just broke them down...things like oh it has Two sharps at the top of the page so its in the key of D, then the chord progression starts to make more sense......then I would transcribe the guitar solos tab notes which are numbers to what they are in notes and what scale the solo is in.
in fact I have my notes right here and I was in the middle of breaking down Ratt's Lay it down. Laugh I know, but I love all those old guitar players.
The song has one flat so it is in the key of Dminor/fmajor. Then I broke down all the guitar notes and was trying to put together all the notes d minor in all the modes to understand what could be played as a solo during the song and how warren dimartini came up with it...
anyway. Hopefully that site can help you. I know it must be weird to take advice from someone who never actually accomplished what I wanted but I someday hope to and will go back to all this stuff to learn. Like theogt said it will at least teach you the keys, chords, scales and modes and you can use the tab to just practice the shape of them. it will make your fingers much stronger.