I HATE MY NAME (or well, my nick-name)?

It's Elizabeth, and I love that name, but so many people call me LIZ and I can't stop it! All my camp friends refuse to call me anything but! And my teachers too! My good friends know better than to call me Liz, at least, but even when I tell my other friends to stop it, they ignore me and tell me to choose between Liz and Beth (no offense to anyone's names) and Beth is just not my style, so I'm stuck with Liz. And then once they call me Liz, everyone around them calls me Liz because they hear them say it! I hate hate hate hate hate Liz and Lizzy. What can I do about it if I can't make them stop it? What are some other nick-names for Elizabeth?