Правильно ли построен текст по грамматике - вопрос №1404636

Today was the first time going on a very strange event. I am very excited. These competitions are held every year in Wales to engage in these sports must be able to swim, fear is overcome from the first minutes under water, just forget about it. I was very scared to go without hands, but I coped, another problem was that breathing through the regulator. The distance I have swum for 10 minutes, I know it's long, but it's my personal record. I don't understand how Dan Morgan from Wales covered the distance in one minute 30 seconds - this is a world record. Swim in the swamp with a mask and snorkel is very scary because the water is turbid and it is hard to see. I was the last among my competitors.