Wheresthewishmagic
Bless you, this is so upsetting for you, I can tell. I'm pretty sure I might be older than the ave age of the mums netters, and can see some of your dilemma in my own family. I think the fact that this is your older sister is relevant. Even though you are both adults now, it is very hard not to always hold on to that seniority that we give to older siblings if we have grown up with them supporting us.
It is so important that you live your own life. You said your partner also wants this decision the way you want it.
Your words " however I strongly believe in it and would upset me greatly to not go ahead." say everything. It is time now to let go of needing big sister's support or even needing to keep her happy or needing to please her. She seems to have a hold over you. She does not seem to be saying that she knows you are both different and she just wants you to be happy and that you are sisters no matter how different. Is she rather controlling? Does she have to 'win' all discussions and get her own way even about decisions to do with your life?
You have a partner. Your Partner and you do things together now. You are not little sister any more. Go ahead and do the thing that would make you happy! It is very important in life to be yourself! We cannot be responsible for the feelings of others.
Sorry to go so serious but Polonius in Hamlet made the very famous advice so often given :
"to thine own self be true,
And it must follow, as the night the day,
Thou canst not then be false to any man."
There are so many excellent quotations about being true to yourself. That alone tells you how essential it is to be yourself in life or you will not ever feel right. Please believe me. I really do know, having tried to please everybody most of my life and ended up very unhappy.
I'll put in a couple more quotations:
“What will a man gain by winning the whole world, at the cost of his true self?”
― Jesus
“Your ideal life is your real life. Be true to yourself and honor your preferences.”
― Maria Erving
and Debasish Mridha said:
“You can never be true to others if you are not true to yourself.”
and
“It takes tremendous courage to be honest and true to yourself.”
try:
www.goodreads.com/quotes/tag/be-true-to-yourself
However, MOST important quote of the day said:
"I’m choosing to go ahead and be honest about it even though I know it will upset her." by you.
Well done! We're all with you. Sending you lots of love. Have a wonderful life! 