Rent/Bills issues, need advice..... Options

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I have been living in a house share for the past few months. My first experience living in a flat share!

Its a 3 bed flat with a communal open plan kitchen/lounge/dinner and toilet/bathroom.

I have four housemates. First room there is a married couple, 2nd room has a single girl and (single) me in the 3rd room.

I have the smallest room of the three and recently found out I pay the same rent as the others. Their rooms are much bigger with double beds. I couldn't fit one in my room.

Also, I noticed bills (like electric/gas, tv/broadband/phone. c.tax) are split in 3 not in four. It seems the couple see themselves as one person. Is this fair? I haven't brought it up with them as I don't want any tension in the flat.

The flat is let out by an agency and it seems the couple are the oldest tenants. The bills come in couple’s name.

Is this bill/rent arrangement fair or am I just crazy!?