Am I cooked?

Ok so I live in Bangladesh and I brought a 2 ton split air conditioner. Problem is it's oversized as my room is 130 SQ ft. Only reason I brought it was cuz I directly leave under a sun baked concrete roof and my ceiling is 10ft High. The ventilation is also not that good as my room only has 2 medium sized windows and a varenda. The sales guy said there shouldn't be a problem and that I should just put some specific settings on my ac and everything will be good.

What are your opinion guys and what should I do? Don't think I can return this ac so just suggest any changes u must do