Well, as I'm putting off writing an actual essay, I might as well try.

Dear School,

I know that we have been together for a long time, but I think it might be time for us to consider breaking up. I've known you for about as long as I've known myself and I'm grateful for all that you've given me. I don't know where I would be without you. I'm thankful for everything you've shown me; for putting me in line when I needed it and opening my eyes when I was more comfortable keeping them closed. I wish I had come to this point much sooner, but I'm a stubborn fool. You will always be a part of me, but we've changed and I think we're drifting in different directions.

The last few years have been rough, with our on-again off-again relationship. I can't keep doing this to us and I'm sorry, but I think I finally know what I want. You've helped me realize this, but I fear that I'm being held back. I need to learn and fail and succeed without you as I once did with you. The only thing I need to figure out now is how much longer to stay before leaving. Two years seems like a long time, but I've left too early before. I just hope you understand.