Your father is not wrong for feeling the way he does, but his choice of response can permanently damage a relationship, with far reaching repercussions. He is sending a very confused mixed message that torah is everything to him, and that he does not have to keep mitzvos bein adam lechaveiro if someone rejects (his idea) of a full torah lifestyle. He has forgotten that derech eretz kadma letorah. You may not be the one to effectively remind him of this. Speak to your father’s rav and explain how this is ripping your family apart.
Your father may think that by expressing his displeasure it will influence them. Problem is, it might influence them to pull away and he could lose the opportunity to have a relationship with his future grandchildren.
It sounds like you come from a family that is committed to Torah. Try to view your life with emunah that H’ will bring you whoever is your intended one, and he will not discount you over the choices of a sibling.
You never stated how you feel about your sister’s choice of lifestyle. Do you view it as rejecting frumkeit? If so, it’s no surprise that you would fear someone else rejecting you over the same judgements. If, however, you continue to view them as frum, albeit having made different choices about how to lead a frum lifestyle, then you might attract someone with a like minded point of view (who believes in ailu v’ailu divrei…..).