Hey
Ich würde gerne mal eure Meinung und Verbesserung zu meinem Vorstellungs Brief (bzw. E-Mail) an meine GAstfamilie hören 
Dear XY
First of all I want to thank you for welcoming me in your family. In this letter I want to introduce myself and tell you something about me, my family and my life.
My name is Marco and I was born on the 13th of August 1997 in Germany. I live in XY, a city near to cologne with my parents and my older sister. We live in a house with a garden, outside of the city centre.
My sister is 19 years old and studies at university. Under we week she is living in her own flat but she is coming home every weekend. My mother is only working a short time of the week in a little shop and my father is working as an industrial mechanic. Because he has flexible working times, he is often not at home or sleeping at daytime.
I would consider myself as a calm person. I wouldn´t say of myself that I am shy, and if I am, then just at the beginning. I don’t think that I have a difficult or complicated character, and I think I can deal well with new situations. The only thing which will be difficult for me is the food. I don´t like many meals which won´t be a problem for me, because I don´t have a problem with not getting a meal or just a little. I hope that won´t be a problem for you.
I´m very interested in electronic and like to play computer and unlike many as other teenagers I´m not that kind of a person who likes to spend the whole day with friends. Nethertheless I like to do other interesting things to not spend the whole day inside of the house and if there are so I will enjoy being on the move the whole day.
At the time I´m visiting the 10th grade of a gymnasium (high school) with physics and math being my favorite subjects. After I finished school I want to study something like engineering, but because speaking English is crucial I want to increase my English skills. I think I can already speak fluently with some deficits in grammar. I hope I can maybe improve this a bit in the three weeks I spend in London.
Besides improving my English I would like to visit the city and see some interesting spots of London.
To end up I wanted to inform you about my arrival time. My flight will arrive at 6:50 PM at London Heathrow. I´m not familiar with flight so that I don´t exactly know when I can take the train to your house. When I can take the train at 8:00Pm I will arrive at 10:00 PM. Will it be o.k. for you if I will show up a bit later in case I don´t directly find the right way?
I am really looking forward to my travel to England,
Yours, Marco.
Benutze ich zu oft „arrive“ und „I“? Würde mich sehr um Hilfe freuen