dream

Recently I've been thinking about my life.I'm going to quit a job in Feb,and looking for a new one.
I already decided to change my job last year,and I've known what is my dream.After I decided it, I felt really good,and I believed that I could became a English teacher for kids.
I've just started to study about teaching English,and day by day I'm worried about my future,because there is a big gap between ideals and realities.I could join a class with my English teacher,and watched how he tought them,and my English level is still low and not enough to teach.
A part of me ask me"It is just..like when I climb to the top of a mountain,sometimes I hesitate to do it because of fear.I feel it is not good if I turn back halfway so I can stop it now...and if you don't reach the top,is it meaningless?" Anohter me tells me "There is no meaningless things in my life.Any experience I had gives me something."I don't want to give up.