You can't be in two Alliances at the same time, so you must leave your current Alliance if you wish to start a new one. However, if you are having issues with your Alliance Leader, you can reach out to our CS Team (https://nexonm.helpshift.com/a/dominations/?contact=1) so that they can assist you further.
No Matt. You should leave your alliance and create your own. Create a specific name so it's the only name people could find, so your friends will be able to reach you.