can anyone tell me what i can use that's the size of a GoPro and can live stream to OBS or similarly work as a wireless webcam and costs less than a hundred pounds or doesn't need a monthly subscription to do so 
Logitech Brio. I have one, and it does its job very well.
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@WarmasterPalak there are at least half a dozen models under the "brio" name, which one do you have? does it have a wide angle lens?
@mavica_again
I have a Brio 100. It's small and very easy to use. It might not have all the features you may want, but it is cheap and easy to set up. I don't think that the Brio series has subscriptions (at this time) but it is a good starting point for looking for something inexpensive.