I could sit on photoshop and work on something for hours but I have no creativity. Sometimes I look on tumblr and instagram for ideas. I like doing this shirt stuff but its hard for me to come up with ideas and I don't want to jock. Any advice ?
Honestly,I think it depends on your motives. If you want do do it as a creative outlet, then you're going to find that difficult because you should be obsessed with creating/drawing whatever, you should want to do it every minue of the day and have a sketch book and ideas bursting out of you..BUT you may also not know HOW to be creative, personally, id say fuck Instagram and tumblr,get a camera and a sketchbook and take photos of everything stick em in your sketchbook/scrapbook build up reams and reams of images this could me made up of anything, for example.
Your environment and your world: Signs, signage, books, fonts in books, magazines, food packaging etc
Then you're building up a catalogue of what you see in your world ,then start messing around with it, photocopy it, scan it, mess with colours sizes, take sections of things, don't even worry about creating a design, that will just come. What you need to do is develop your eye.
In the same way that someone like Dr Dre or Timbaland or Just Blaze, although they are essentially hip hop producers, I guarantee you those guys will have shit like Led Zepplein, Steely Dan, the Carpenters The Clash, Sex Pistols etc in their record collection, collect little elements from other things, to create something original.
Hope that helps