sometimes practice time isn't playing songs but practicing technique/scales/whatever.
if you're messing up because you're having trouble holding an awkward chord, or having trouble with a chord change...practice that and only that. if you've got an hour of practice time devote 15-30 minutes to "practice" what you're having trouble with and the rest to songs. repetition for me is best.
also consider sitting posture and hand position for fingerpicking or how you're holding a flatpick. there are youtube lessons on a variety of techniques here and find one that feels best for you.
if you're having trouble with tempo, playing along with a record is a great idea if you're not using a metronome.
I'm not sure how to help you exactly but these are my initial thoughts. Best of luck and keep at it.
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