When I was young and single, I had a lot of mail friends but not femail friends. = When I was young and single, I had a lot of male friends but not female friends.
I went to a all boy middle and high school, and when I went to a university, I took a break from colleage to serve in the military. = I went to an all-boys middle and high school, and when I went to university, I took a break from college to serve in the military.
So I didn't have much time to hang out with femail classmates. = So I didn't have much time to hang out with female classmates.
These days I met mostly hometown friends. = These days, I mostly meet hometown friends.
As we grown up and aged, We didn't have much chances to see each others. We gradually stopped keeping in touch. = As we grew up and got older, we didn’t have many chances to see each other, and we gradually stopped keeping in touch.

Teacher’s Comment:
Great effort! You clearly explained your experience and reasons. Keep working on verb tenses and spelling, and you’ll improve even more. Well done, Sean!