You do not need to forgive your sibling.

The pressure comes from your own idea of who you should be, not from wanting forgiveness. You want less bitterness and a connection that does not erase the harm, but you’re still unsure what would make closeness feel safe.

If nobody expected you to forgive your sibling, would you want to?
No, I feel pressured to forgive.
If you could stop feeling bitter without forgiving your sibling, would forgiveness still matter to you?
No, I only want to stop feeling bitter.
If you could have that connection without forgiving them, would you still feel you needed to forgive?
No, the connection would matter more.