Welcome to AS Moon Wolf!
I've had a shot at answering your questions, and I haven't read any other replies so I'm sorry if I repeat things!
Stranger rape and acquaintance rape are both just labels so not every form of rape will fit into boxes like that. I understand that it can feel important to be able to label what happened, but I don't think a label is helpful in this case. Somebody who was raped by someone they'd known for a few hours would probably face similar issues to both stranger rape survivors and acquaintance rape survivors. Why is this distinction important to you?
I haven't, but I know it can and does happen. Whether the abuser is older or younger, it is still abuse. If this situation applies to you: it wasn't your fault, you didn't want it and your feelings are entirely valid. I'm sure you'll find people here on AS who have been abused by someone younger than themselves.
No. I worry about whether I 'asked for it' a lot myself and I think many of us do. We didn't fight back, didn't say no, wore tight-fitting clothes, acted flirty with the person who later hurt us... I don't want to minimise what happened to you, I just want you to know that you're not alone with feelings like that. There is a reason why you stopped and you yourself know that it wasn't because you wanted to be hurt. You didn't ask for it and it's not your fault.
I hope you find AS as friendly and supportive as I have. Take care,