Please help me edit/ improve/ end my 8th grade graduation speech!?

I think you have a good beginning! You are writing about transitions, how fast they happen, how difficult they are, and who can help you on them. I think you should list that more clearly in the beginning of the speech, because when I was reading it, I really started to "get" where you were going around the fourth sentence. Then, when you come to the end, you can talk about how the lessons you learned and the guidance you got through all these transitions have laid a good foundation for the future and you are grateful for that gift. Congratulations!