When i set up a meeting i don't become the host

Odds are your account is under the Named Host licensing model, and you are an Administrator of the account. If this is true, here is how the licensing works on your account.

Administrators can do anything except upload content to the Content library and Host Meetings. To Host Meetings you must be a member of the Meeting Host group and have Host rights within a Meeting room. If you are not a member of the Meeting Host group you will only be granted Participant rights to a meeting room, until a member of the Meeting Host group arrives in the room. Then you will be promoted to a Host within the room.