Hi aeshildr!
That way you wish there is no option. If you play on pc there is an option to switch between the realms in case you have registrations at other realms with the same account.
http://prntscr.com/ac1s7nYou can create a new account then the system will give you the realm which started last time out of all realms.
Or you can continue that one you started. If its an x2 realm then no problem because players has different advance. You can also play a new account until the current era ends, then you can play again with your favorite one.