Should I send this letter?

[Farontothemaddingcrowd]

I haven't seen my dad since I was a baby. I only know what my mum has told me about him. I've wrestled with the idea of contacting him for 20 years. He isn't ex directory and his address is traceable. He's twenty years older than my mum and it's getting to now or never territory.
Mum is a narcissist who lies about many things. She changed my surname shortly after I was born and I now wonder if it was to hide me from my father. She has always told me he didn't want me and yet he paid generous maintenance for me until I was 21.

He's from Egypt and I know nothing about my heritage, despite being dark haired and eyed and olive skinned.

I'm terrified of rejection and also terrified of him dying without me ever having answers.

I've drafted this letter. AIBU to send it?

You only get one chance at life op, if you don't send it will you always wonder 'what if?'

Good luck! I hope your dad turns out to be a good guy and he gives you some answers and a relationship that suits you both going forward.

Thank you. He looks like me and my children and I'm really curious about my heritage.