Answer:
Dear cinema manager,
I do not appreciate you discriminating against me because I am a teenager, and because I was standing in the rain waiting for a ride. I apologize for standing on your property while trying not to get rained on, but I feel like it should be okay to stand where I will not get rained on. Thank you for reading this letter.
Step-by-step explanation:
I don't know if this might be right, but it seems like it should be.