Should I be considered a real estate agent because I rent rooms?

Probably not.  You are considered to be a real estate professional (i.e., in a real property trade or business) if:

1) more than one-half of the personal services you provided during the year were performed in a real property trade or business in which you materially participated; AND

2) the number of hours in which you materially participated in this real property trade or business was more than 750 hours; AND

3) you must materially participate in each rental real estate activity unless you filed an election to group all rental real estate activities as one (and materially participate in that activity).

A "real property trade or business" means any real property development, redevelopment, construction, reconstruction, acquisition, conversion, or rental operation, management, leasing, or brokerage trade or business.