can you fix my grammar please?

[Matthew]

I am very thankful and happy, Junior year has definitely been the best year of high school for me. It was the year where I learned many things and changed as a person; in middle school, freshman, and sophomore years of high school I didn't care about school at all, I didn't do my homework, the whole classes where I really did homework in my sophomore year was in English. I thought school was stupid and pointless and I basically did not care about showing up on time and if I did do an assignment it was usually late and not done to the best of my ability; except for English during my sophomore year. I did my work on time and tried very hard on it and got a good grade. Freshman year me and other freshmen were known as stupid freshmen by the upperclassmen, the guy who I was head over heels in love with broke up with me via Facebook message, which I did not see coming at all because just the day before we were chatting for hours on Facebook and we were like: "No you go offline first, no you do okay, we will both go offline for five seconds okay". In five seconds, we were still both offline, we were getting along just find, and the next day out of the blue he broke up with me and told me he never actually loved me, and he was my first boyfriend and that was back in 2011. I just got over it completely like a month or two ago, but my Junior year I learned you don't need a boyfriend to be happy, school is very important and I started trying hard and doing my homework and turning it in on time, and not being tardy.