Jealous much?

Is it bad to want your boyfriend all to yourself? Like i know he's at the mall with his sister but I can't help but to be jealous wishing I could be having that much fun with him rn. It's long distance and I get to see him every week but idk I feel bad for feeling this way and I do like the fact he's a very good brother and I think family is very important I just can't shake this feeling do you think it's because I miss him or it has to do with the long distance?