You don't have to go to the gym right away. Start off by walking or getting a small weight set for home. Take baby steps :)

Sounds like somebody's making excuses

Try the rowing machine (:

If you have a pool available start with swimming.

Hopefully once you are in shape your parents allow you to wear yoga pants!

vertigo, much?

I got sick on a treadmill once. Blacked out and fell face first into metal. Woke up in Florida riding a dolphin named Marlin wearing a tuxedo. ....That last part might've been a dream lol.

Well shit, atleast you're giving it effort, take it easy at first though, and best of luck OP.

Lift weights instead?

I don't know if you're depriving yourself of food in an effort to lose weight, but that may be a reason you got motion sickness. Be sure to drink plenty of water, too! And take it slow :)