Self Improvement Made Easy

Whenever there's something important to be done, I'll say to myself that I'll do it later. I always find something else to do(even if it's totally boring and dull). People will say to me "Just do it", etc., but every time I try, I find some excuse for doing it 5 or 10 minutes later. It's so bad that I sometimes stop doing the things that I really enjoy doing. Is there anything I can do to break this???