yes this is happening to me right now

Total Opposite for me. Room is always crazy hot, like even in Winter. It's horrible

It's probably the seal around your window, do you see any water droplets or damp?

You should call a repairman out to take a look at it and also invest in some thermal curtains to keep in the heat.

Maybe you need some better insulation.

Close your door it will trap all the heat in your room

Do you have insulation in your walls ?

I'm sure it has something to do with the insulation or your A/C isn't working properly, one way to fix it is to keep a few electronics on in your room and it'll heat up just like mine always is, just kidding that can be dangerous but still it works.

Most likely a poor insulation, however you could always try buying heaters.

I've studied in HVAC, are the vents on the floor or on your wall, make sure none of the returns are blocked in your house, do you hear the blower kick on shortly after your turn on the heat? Is it only your room or is it the entire house? If it is the entire house and your blower kicks on it is possible you could have a cracked heat exchanger. Let me know more and i might be able to help with your problem

Your windows could probanly be compromised