Being a P.E Teacher without a doubt would have to be the job that I think fits me.

Getting a job as a PE teacher is becoming more and more in demand in Korea, since the number of students are getting keen on sports and they are required to take these subjects in middle and high school. = Getting a job as a PE teacher is becoming more and more in demand in Korea, since a great number of students are getting keen on sports and they are required to take this subject in middle and high school.

When I was in high school, I was interested in playing outdoor activities and loved my P.E teacher simply because I respected him as a great teacher.

Physical education course is expanding in Korea. In the past, students only had their PE subject one or twice a week but recently most schools obliged their students to take their PE subject thrice in a week this means these school should hire more PE instructors. = In the past, students only had their PE subject once or twice a week. But recently most schools obliged their students to take their PE subject thrice a week. This means these schools should hire more PE instructors.

There are a couple of reasons why I think it’s the best job for me.
Being a teacher is not only a worthwhile profession but an honorable job as well. My character is so active and I like to teach students since I was in university. Especially it would be very rewarding to help students to build an upright character. And the time with students is very meaningful because I felt that they are happy to play several activities. =  And the time I spend with my students is very meaningful because I feel that they are happy to play several activities.  Since patience and tolerance are acquired to be an effective teacher, I always think that I will be willing to give my efforts to students. Therefore, being a teacher is very rewarding as well as an honorable job. (You already mentioned this at the beginning of this paragraph)

I still remember the first time to do teaching practice. At that time, I was … = I still remember the first time I practiced teaching. At that time, I was …