Okay that makes more sense now: I think TJP may have thought like me that you were talking about staying in the present tense or something
Okay so now we could have:
"I'm not always gonna be able to give you what you want
Sometimes i'll try, try and try yet mess it all up"
Sounds good
If i'm trying to put something on paper, that i'm later gonna sing with the F word i often just substitute "muck up" for F up...