I think your writing is pretty good. I corrected some mistakes (see below). Well done, Fernanda!
So Last Sunday, I woke up very early to exercise. I am not so used at doing to waking this early, but since the day was a little bit cloudy, I decided it was an excellent idea. I think it is because here in Mexico the weather tends to be really hot, so I find that cloudy days are the best thing that can happen... really... so right after that I took a shower and i hurried on getting to get ready. On In the afternoon, I went to eat some supper at an amazing Italian restaurant. Right after that, I went for a coffee with my cousin and her best friend. It was a very relaxing day... Greetings!