This is a letter to my parents, what corrections should I make?

First I want to say I love you both very much and that you have both been helpful to me during my high school journey. When the first day of high school was approaching I was nervous and scared of what was ahead. But you helped me to rid of my fears and I entered high school with a brave vigor and a steady confidence. When I was picked on, you told me to stand my ground and be ertive. Whenever I felt like an outcast, you gave me positive reinforcement and told me tomorrow would be a better day. You have both also helped me when I had difficult ignments. Mom when I needed help writing a paper you were there to check my grammatical mistakes. Dad when I had trouble with my math homework, you were there to teach me. I thank you greatly for helping me throughout the years. I am forever grateful. Despite the fact you have been great parents to me, I have not always been a great son. I have talked back, ignored and sometimes even insulted you with no remorse. Yet you have put with my teenage angst and continue to love and help me whenever I needed. There was a time when I was very rebellious. I had deeply loathed you (I felt I did). I would spend more time with my friends and less with my family. I would complain to my friends about the strange traditions, customs, and behaviors you both had. I soon felt completely detached from you both and wish I never had you has parents. But It was apparent that I was lying to myself. I only acted this way out of angry and soon enough I came back to you both crying and begging for forgiveness. You have been through a lot with me. You have been through the terrible twos, first day of kindergarten, middle school, and high school. I thank you guys for everything you have done for me. I will never forget it.