My dog thinks I've finally lost it.
She's right.
The rhyming, where did that come from. How do you know how many lines to rhyme before a new one?
I'd love to be able to answer that easily, but I can't. It's a "feel" thing to me, which involves several factors including the intention of the song, beat, tempo, mood, etc.
I am not bad at all with the english language, but I always end up getting frustrated.
Never give up. I have been know to get partway thru a song, get writer's block, and put it down for anywhere from a day to years. Sometimes the inspiration to fix it appears, sometimes they hit the trash.
I'm not short on thoughts either. And I end up writing lyric that sound like generic green day. My other big problem is I always end up with the melody of some other song. This is a problem for me when writing the lyrics and when trying to make unique music on the guitar. I guess it must come from all the years of playing lots of different covers. It seems like all the real estate on the guitar has been bought. I can't find a unique sound. All my favorite songs on the radio have some sort of riff, unique progression or something that makes it easy to pick out and whistle along to. How to they come up with that?
People have been making music for centuries- "modern" music for decades. It's all been done, to one degree or another. Coming up with something entirely original is literally harder to do every day. Sooner or later, your original composition is going to "sound like" something from someone. I have two thoughts on this. One, that no matter what you do, odds are that SOMEBODY is going to think your new tune sounds like so-and-so, whether you think so or not. Second, if you have a good listen, there is a lot of published music that at least resembles other published music, but is just different enough to get away from it. I could give you a ton of examples. So, even some of our stuff touched on someone else's material.
We had a song called "Kickin' Stones" that was probably my favourite. It had a really solid riff, a hook that I could literally play endlessly and not get tired of it. It may have been coincidence (we certainly didn't intend to) but it bore a resemblance to Ted Nugent's "Stranglehold". Same key, same tempo, same mode, similar phrasing. In fact, I was playing it one day and came to that realization. To my chagrin, I realised I could switch back and forth between the two songs completely seamlessly and without missing a beat.
Then again, I found I could do the same thing switching from Stevie Wonder's "Superstition", and Wild Cherry's "Play That Funky Music". And yes, we DID have quite a bizarre repertoire!
Don't kid yourself- I wrote some real crap, too... I threw out at least as much as I kept, maybe more. Practice and experience. And for what it's worth, I would rather attempt home-vasectomy surgery with the rusted-out rear quarter panel of a 1978 Cordoba than listen to Green Day. Just sayin'.
Toystory gave you some awesome advice. 
