Property management contract length

[Eric Littlepage]

I'm an owner, and I'd like some clarification on what you think my property management contract says, as far as length of term.  It says:  "This contract shall begin on _______ and end 12 months from date of beginning.  At the end of the agreed term, the agreement will automatically renew for another twelve (12) months unless the owner gives realtor a written thirty (30) days notice of termination, which may be given at any time during the month, provided that any cancellation shall be effective as of the end of the calendar month following. (Ex: notice given 5/15 will be effective 6/31)."

It has been 5 years now since I've signed this, so apparently it's been renewing, even if I haven't resigned anything.  What I'm wondering is, does this mean I can only cancel my property manager on the one-year anniversary?  That seems a little extreme to expect that, but then again the leases with tenants are also one year contracts too....