I was there not very long ago, and sometimes I still feel that way. But the change I made is to be strict without being restrictive, discipline with a sense of freedom. The biggest habit that has helped me is to just choose 2-3 most important things to do in the day and try to get them done as early in the day as possible. It feels so great to accomplish, and it's challenging but not unreasonable. Choose one goal and I feel like a failure and if I don't do it. Choose ten and I won't even do one. But a few good goals is the perfect balance, if I miss one but get the others I feel good. (This habit I learned from Zen to Done which also has nine othrt useful habits to slowly adopt over time)