First, start training your ear and ability to keep time with a metronome (you can use the Guitar Tricks one or there are plenty of metronome apps). Once you get used to playing with a raw "click track" it'll be easier to play along with songs.
Secondly, start with just root notes or root chords when you pay along with a track and don't worry so much about the full tab.
How long have you been playing? I know it takes some time to develop the comfort to play along. Several months to a year isn't unusual.
Hope this helps.
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