The best motivation is the one that comes from within you, not from others, to be able to lift yourself up each time you feel down, that's true strength, here are some things to tell yourself when you think you're not good at all:
1- I am who I am today because of the choices I made yesterday.
2- I am done with the past, the future has plenty of room for change.
3- Everything happens for me, not to me.
4- The more I work, the luckier I become, and as long as I'm dreaming and aspiring I'll have to put in a matching effort for those dreams.
5- My self-worth isn't determined by others.
6- I'm strong enough, I'm going to face my fears, take action on my dreams, be happy and never settle for negativity, I'm doing all the above, just because I'm strong.
7- I'm stronger than my body shows! because strength is nowhere but within me.
8- I walk slowly, but I never walk backwards.
9- What I do matters, but why I do it matters so much more.
10- If I desire to make a difference in the world, I must be different from the world.
11- I won't care about what others think! I won't ever let anyone steal your dreams.
12- I'm human. I have weaknesses, I make mistakes, and I experience sadness; but I learn from all these things and they make me a better person.
13- There will never be another now. I will make the most of today. There will never be another me. I will make the most of myself.
14- I'm the one that's got to die when it's time for me to die, so let me live my life the way I want to.
15- I deserve better, I deserve deciding for myself, I deserve doing something I love and being somewhere I love, and no one is going to give it to me, so I might as well take actions now on what I want to do.
16- The bad things that happened to me, turned to be memories worth to be told, turned to make my life fun.