I am a female, 01/December/1995, struggling to become a succesful person

I need some advices and some reasons about improving myself and my life.
First thing is, i just quitted my studies few months ago due to some reasons, major problem was from the lecturer. My father has business in this city, he told me that i can choose wether to start learning the business techniques from him or reconsider about my studies again. But he prefers if i continue my studies. As i am interested in this course as well, it just that the surroundings kept pulling me back and made me really unmotivated during those days and made me quitted.

Second thing is, i am the person who is an introvert and slow in understanding something. Also, i do my work very slow and keep delaying them. I always wanted to finish all my works, but it is really hard for me to even walk. Am i really that lazy?

How do i change and have a better behavior? Is it even possible to change my bad behavior/habit?
I want to be successful at young age like the others too.