Yeah you’re not the first to tell me that. I’ve played on and off since 2007. I’m no longer a beginner, but I’m not very good, so let’s say “low-intermediate (Grade 4?)”. I used to play You Shook Me All Night Long, Surf Rider, and I started Mellowship Slinky in B Major and Street Spirit. Then I jumped straight to Johnny B. Goode which was a mistake indeed, but hey, I wanted to be like Marty in Back to the Future (I was studying physics, so Doc was already covered)!
Then I played mostly rhythm guitar/chords while singing. When I decided to get back to guitar more seriously and buy an electric guitar if I kept a it for more than a month, I also decided I wanted to learn Stairway to Heaven. I figure it was significantly slower than Johnny B. Goode, but it might still be too hard (Grade 6+ according to Justin). Now that I’m halfway through the solo and I know the rest of the song though, I’d really like to finish it. I’m happy I discovered the “teacher” part of the website: I believe it could help me figure out the foundations I lack. I’ve been thinking about finding a teacher for a while now, but it’s hard to choose somebody and to know just by reading a description if a teacher will be good in pedagogy.
That was my suggestion, too. Pick more songs, across a variety of difficulty levels and maybe styles. I’m usually actively learning about three to four songs on any given time, one or two of them are above my level (my dreamers) and I spent a long time on them, one or two are on my level and I spent a few weeks learning them, and one is an easy one I only need a few sessions to get mostly right. It gives you a nice ego boost^^ I also play old songs regularly, as not to forget them and keep them in my mind.
Just catching up on this thread and thought I’d add my thoughts. From my limited knowledge of psychology, research shows that success leads to motivation more than motivation leads to success. So advice about trying something a bit easier is spot on - the feeling of success is likely to increase motivation.
I have to say that if I’d been learning any song for 10 months or more then the chances are that by the time I’d finally got it, I’d never want to hear it ever again! If I’ve not made significant progress in a song within a month or so then it’s probably beyond my current level and I’m likely to park it. I do try to push myself with songs that challenge me but there’s definitely a point where it becomes demotivating and it’s best to save it for another day
I’ve played on and off since 2007. I’m no longer a beginner, but I’m not very good, so let’s say “low-intermediate (Grade 4?)”. I used to play You Shook Me All Night Long, Surf Rider, and I started Mellowship Slinky in B Major and Street Spirit. Then I jumped straight to Johnny B. Goode which was a mistake indeed, but hey, I wanted to be like Marty in Back to the Future (I was studying physics, so Doc was already covered)! 
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My wife.