Watch the Practice Session 15 online guitar lesson by TrueFire from Learn Guitar 1: First Steps for Beginners (FREE)
Keep thinking of the beat here even if the drums and bass are sounding cool! Your job is to just drop your guitar part into the mix. If this is too fast, it may be best to work on it for a while without the backing track and even set your metronome to a much slower tempo until you get the changes and the rhythm down. It's better to get it down slow and steady and then gradually work it up to speed, so take as much time as you need doing it slow before you jam with the band!