Generating bitoin private key and public key(like paper walle) without trusting third party

I want to have a Bitcoin wallet(public key and private key) without: downloading BTC blockchain (due to slow network, low disc space, expensive internet in my country)
Trust any program,app,website, …
buying a cold wallet(Not enough fund, Its not profitable for me)
What is the solution?
your sincerely
Maysam