Is hating my boyfriend’s sister a good reason to leave?

Hi, lately I’ve been asking myself if I should keep going in my relationship with my boyfriend because her sister means a problem for me. He really loves her and they have a close bond and I would never take that away from him, but unfortunately I find her really annoying. It’s very hard for me to be around her because I can’t ever have a conversation with her, or I feel really awkward when we have to hang out.

I think this is a big problem because I know that, as they have such a strong bond, I will always have to be near her. She will be there in every big moment in my life and I don’t like having to fake smiles for her, or trying so hard to get her presents, I feel like I would rather never visit his house so I never had to meet her. I have pictured myself having kids and I hate imagining that she will be around them.

I really tried to have a good relationship with her because I know that’s important for my boyfriend but I couldn’t. I swear I tried a lot but we just don’t get along. And I feel bad because I feel that everything that I am with her is not real, and I hate being so fake.

I know that if I told him how I feel about her, he would even tell me to leave.

Any advice?