Can someone check my grammer?

Dear Mr. Cattanzara,

First of all, how are you? It's George, you probably wonder what has been going on with me after I left the neighborhood, so please allow me to tell you a bit about my life now.

After I had completed all the final exams I found a job in a clothing store, I decided to work there for a while so I could pay for my studies at the university.

At the time I met a lovely girl named Karen, she is beautiful and also very intelligent, she just started to study biochemistry

at the university.

After I had saved enough money I started to study architecture

at the university. It wasn't easy at all, I found myself many times regretting I hadn't chosen something easier. Eventually, I did it, I achieved a BA in architecture, at that time, I would not have even imagined graduating with a bachelor's degree.

I work in collaboration with a building engineer corporation, the people there are very nice and treat me very kindly and respectfully.

After Karen and I had enough money, we moved into a very nice apartment in a good neighborhood.

Well, Mr. Cattanzara, this is my life, a little bit hard to believe, don't you think?

I like my life, even love it thanks to you, I try to visit my father and Sophie every two weeks, they are both very proud of me and I hope you will too.

Certainly, none of those wonderful things wouldn't have happened without you. I took your advice, I picked myself up and realized that life would not wait for me and it's time to start living it.

Yours sincerely, George Stoyonovich