Thanks for all of the responses!
Unfortunately, I don't have a family of my own to holiday with so I can't use that as en excuse. But I don't mind taking a week off in the summer and going to a nearby beach!!
My family leaves all of our issues on the back burner and don't ever discuss our feelings. So bringing this up is going to be really tough for me. I live about 30 minutes away from my parents so I can discuss this issue with them in person the next time I see them. I think doing this will be very beneficial in the long run; they will then know why I am quiet during family gatherings or why it looks like I am uncomfortable.
Thanks again! I really appreciate it!!