Why be Catholic if you aren't actually Catholic?

I hope to specifically hear responses from people in this category.

Why be Catholic if you don't actually agree with the Church and her teachings? I've spoken to quite a few people who fall into this category, but I've never actually asked them why they bother being a Catholic if they think the Church is wrong on some teachings. Wouldn't it make more sense to join a protestant church?

Edit: This is not meant to address people who struggle with teachings but seek to understand and accept them. This is meant to address people who disagree with the teachings and do not seek to accept them.