I have a family problem...

My family has went through the EXACT same thing, except I didn't want to see my Dad- but my mum's boyfriend is going through that with his daughter.

The point is, if あなた really want to talk to him- you'll find a way. Secretly send him your mobile number and text または call him.

または do the e-mail thing.

または the scariest one of all: TELL YOUR MUM THAT あなた WANT TO SEE HIM.

Trust me, I know how scary it is. But, あなた have to, she should understand. TELL her, he is STILL your father.
She is supposed to be the adult, so she should start 芝居 like it and just freaking drive あなた to his and stop 芝居 like a child. She doesn't have to talk to him- just agree on a time for あなた to be picked up/dropped off and she should just drop あなた off outside his house and not actually go in. (but be もっと見る polite than that :P )
This is about what would make the divorce easier for あなた as it affects children もっと見る than adults (phsycologically, または so I've heard), but it is traumatic for a kid, anyway.

As for the awkward thing, I can SERIOUSLY relate to that. I was so afraid of my dad I completely cut his side out- COMPLETELY. My cousins don't even remember me and I loved them so, so much and I babysat them like every week. Trust me, it's not something あなた want to go though.
My point is- just suck it up. Hell, yes, it'll be awkward but あなた honestly will go past it and there is NOTHING to be scared about- they STILL 愛 あなた and always will and I BET あなた they are missing あなた too. I PROMISE you, it'll be OK.

Can't あなた just take the bus if your mum won't drive you, though?

Good luck honey! Fingers crossed for you! xx

k my parents are divorced, so I know what あなた are saying there. I honestly think あなた should send him an apology Eメール and tell him that あなた really would 愛 to see him sometime. I hope this helps!