I feel that my playing isn't fluid. I know chords and can change them pretty quick, but all the strumming patterns I play are pretty boring. I can do quarter strumming and eighths, and it gets boring with too simple divisions of quarters and eighths on a 4/4 bar, but when I try some more difficult strumming patterns (with muting or rests for example) I get really confused and no matter how much I sit on it, I can't nail it down. It doesn't sound right. I want to start writing songs, but while I can think of neat chord progressions on the acoustic, the strumming patterns are too boring/not fluid enough for me to feel that I've done something right.
Sixteenth strums are also a problem. I tried learning "The Trooper" by Iron Maiden, and I have it fine til the verses with the sixteenth notes/triplets or whatever there is there.
And I tried improvising with some scales I learnt, but the rhythm is problem here as well.