my dream

i (I always writes capital "I") want to be a teacher in the future.

In future I want to be a teacher.

first,ii think to be a teacher is a good job. (new sentence starts with capital)

First, I think it's a good job to be a teacher.

because i can always stay with the youngers nomatter how old i am.

Because I always can stay with young, no matter how old I become.

second,i love the feeling it the schoolastic atmosphere.it is fall of youthful spirit.

Second, I love the feeling of the school atmosphere, it's full of youthful spirit.

i want to realize my dream and make myself to be a well-qulified person.

I want to make my dream come true (but your version is very good as well), and be a well qualifed person.

You should work on word order, and lbe little more careful when typing,

but excellent job, indeed good, wish you luck in future.

As for your dream.

It's a beautiful dream, and you should always use it to motivate yourself.

As the saying goes;

"Imagine yourself who you want to be, then take action to become him."(or her, of course)

I'm happy you know what you want, that makes even a stranger smile ^^

My best regards and hope everything will work out for you, take care.

My Dream

I want to be a teacher in the future.  First, I think it is a good job because i can always stay with the youngsters no matter how old I am.  Second, I love the feeling of a scholastic atmosphere.  It is full of youthful spirit.  I want to realize my dream and make myself a well-qualified person.

Good for you!  I also think that being a teacher is a great job.