I have played guitar for about 5 years. I own an acoustic and electric guitar, nothing terribly fancy. I've always enjoyed learning new songs that I like, and can sometimes get fairly good at them. However, I've never really played for more than about 10 to 30 minutes per day, sometimes not at all. Until recently I've been content with just learning to play other songs but lately I've felt this overwhelming urge to create my own music. However, whenever I try to come up with even a simple progression I am paranoid that it sounds too much like another song. I feel like everything I manage to come up with is heavily derivative of whatever I've been listening to lately. As a result I feel frustrated and stifled, and whenever I pick up my guitar I feel tired and discouraged after no more than a few minutes. It has really worn me out. Is this normal?
I love music and playing my guitar, I occasionally like everyone does eventually fall into a rut where it feels like you're getting nowhere but all you need to do is keep at it. If it gets too frustrating try to learn something else on or about the guitar and rest your mind so you can come back to it later. Try to set a schedule for 1 hr of practice a day if you can.
Practice Chords, Notes, Learn music theory, Strumming technique, observe your favorite guitar player on youtube watch what they do and feel the music. Its always good to start working on that ear by transcribing simple songs and only check tab sites if you're stuck