Hi könnte jemand mal den Text auf fehler durchgucken?

es geht nur um die rechtschreibung die formulierung finde ich so gut.

Hey,my name is Lennard Müller and I am 15 years old. My family and me are living in Magdeburg. I have 2 bigger siblings, a brother 21 years old and a sister 19 years old. Their names are Felix and Annika. Both of them are studying medicine. My mother works as a teacher in a gymnasium and my father as a scientist at the university in Magdeburg. I am going to the 10. class of gymnasium. In school I enjoy doing physic- and chemistry education. After school I am often hanging out with friends or going in the city. At least 3 times a week I am doing sports. Volleyball and tennis are my favorite sports. If I come to your family you will gain a polite boy who is interested in your country as well as in your culture. I do enjoy learning new things and getting to know the country and its people. Furthermore I usually bother to be helpful no matter whether it is helping to clean the kitchen, walking the dog, which I would love to have on my homestay, or doing some work in the backyard. I also believe I will not give the people living together with a very hard time because of being uncomplicated in almost every circumstances. I do really look forward to meet new people from a different culture. I am sure that we will get along very well.