To improve your personal growth you have to be in the right frame of mind.
Have you tried to motivate yourself, but find you really can't be bothered? Did you give up before you got started?
You should be 100% committed to your self improvement. This can be done by keeping a positive attitude. Your attitude is very important, and if you believe you can't do something, then sometimes you can't, because this is what you have told yourself.
You have to believe you can improve, and then prove to yourself that you can.
Decide how you want to change, keep a positive attitude, and then commit totally and believe that you can and will do it.
Try not to listen to opinions from people as to how they think you are, or how they feel you should be. You know the way you want to be, the way you will be.
If you feel like giving up stay true to yourself, and remember how much you want this change. Be strong and determined to stay motivated. It's easy to slip back into a can't be bothered mood, remind yourself how important this change is in your life.
When you are positive and believe in yourself, you will find the motivation you need.