How to write a message of 150 words to my alma mater?

Alma mater, here, I spent many spring and autumn, and get along with my classmates and teachers, so far vividly, as if just yesterday, I went to Qiu Lai in spring. I didn't expect it to be our turn to graduate this year. I can't bear it. I really hate to part with it. The only thing that resonates in my heart is this sentence. Thanks to my alma mater, it brought me knowledge and friends, and I learned to grow. Alma mater, my alma mater forever, I will.