I want to improve my life but when it comes time to doing it i make up some excu!

I want to improve my life but when it comes time to doing it i make up some excuse?

As you can tell from the other answers, this is a common situation. We have that from time to time. Knowing we need to change, and doing it are miles away from each other.
To help yourself, decide ONE thing you want to change. Start small. Write down what that change is, then break it down into smaller tasks. Choose one of those tasks, and break it down, if possible, into smaller tasks again. Then pick one of those tasks and do it right then.
Once you have finished the first task, give yourself a reward. Not too big to start, just something like a 5 minute break, a glass of water, or a 10 minute walk.
Now choose another task from the list and do the same things. You will find this system can be quite effective.
Lastly, after a few rewards, skip one. And don't over do the work. Sometimes we are so empowered by our initial success we work to exhaustion, and don't want to start again because we know how much work there is to do. That's my biggest challenge. So, take a lesson from me, and space out your changes and your rewards. Look back in one month to see how well you are doing.