If you are able to focus unswervingly on your goals, then all that you desire will become yours.
You have to create your self-belief by going to your core to find the probable reasons for the negativity in you, and then demolish them.
Trust in your own beliefs or succumb to the influence of others'.
It is action that creates motivation.
Just identify the very first physical action you need to take, and do it.
See it first in your mind, then become it.