I was like that, always learning and not practising. I dont know, maybe i was searching for a perfect method, 'the method' that will rule them all. Also maybe i was afraid that if i miss some important knowledge the practise would be harmfull. (For some cases like diet, exercsing you really should learn a lot. But in most cases you should just begin practising whatever you got in your hand.) I was buying books after books and when i really learn the theory i was changing direction.
Then i read Pavlina's self-discipline series, worked on that and in three months i become a totally different person (I became a vegetarian, early riser (just 07:00
but early for me), more productive, regularly exercising guy, quit smoking, coke, junk food etc., get organised and much more
Just accept that we re not really learning by reading, only by doing it. I recommend little steps and 30 day trial method that Steve Pavlina wrote about.