Being In a Hurry All the Time Vs Living Life at a Slower Pace

I prefer to take my time and live life at a slower peace. I do not like to be stressed out or to be in a hurry. Taking into account the fact that stress is bad for your physical and mental health, I do not find any good reasons to stress oneself {more natural to say "yourself"} out. Stressed people are often angry, and it seems like any little detail ruins their days. On the other hand {This phrase is used to introduce a contradictary idea or a different perspective. Better here to use "Also" or "Furthermore"}, being in a hurry only leads to getting things wrong and to then wasting time by redoing those things. that went wrong {I think it's clear what you mean -- I would leave out this last part}.

I used to be one of those people who are is always in a hurry. I was bad at setting a schedule for all of my tasks, and I ended up being late to go to any place I needed to go. I was often late for university {in the States, we would say "school," no matter what level} and felt like there wasn't enough time in the day the day was enough for me to do everything all of I had to do. All the time, I was always running to go to the places I had to head go (school, library, work, the doctor’s, etc.). This situation was causing me to have a lot of stress, which affected my physical health.

That's was the reason why I decided to set myself a better schedule for myself. routine. In This way, I could be able to best manage my time and set aside enough time for rest {Sleep? Or just downtime?}. At first the beginning, it was hard to keep up with this new schedule, but I managed to change my habits and adhere to it this schedule. Ever since, I've lived my life at a slower pace,. I have enough time to carry out all of my tasks without being stressed out or in a hurry to go anywhere somewhere, since I am able to better manage my time.

(Thanks in advance for your corrections)

Not too much was incorrect; I changed a few things to make it sound more natural. ¡Buen trabajo!