Do you think that being self-interested is a bad thing? If so, why? If not, why not?

I don't think it's a bad thing, because you have to do what is best for you personally, but you should make sure that what you do doesn't hurt anyone else

No, it's not a bad thing. Every human has a dream that he wants to fulfill, that he wants to follow. But it can be a bad thing also, depending on what is it a specific person could want. As long as it's fine with you and others as well, or at least doesn't hurt them, it's a great thing. If people weren't self-interested, they wouldn't have dreams to follow, and future to look into.