Can't push gem to the right link - ruby

Question

So I've already built my gem but when I try to push it, it goes directly to Github instead of rubygems.org:
> gem push my-gem.gem
> Pushing gem to https://github.com/User/my-gem...
> Cookies must be enabled to use GitHub.
I've already set up the rubygems link on my gemspec, but nothing chages.
How can I fix that?
Here's my gemspec file:
require_relative 'lib/Mygem/version'
Gem::Specification.new do |spec|
spec.name = "Mygem"
spec.version = Mygem::VERSION
spec.authors = ["Me"]
spec.email = ["email#email.com"]
spec.summary = "Created gem"
spec.description = "Gem utility"
spec.homepage = "https://rubygems.org"
spec.license = "MIT"
spec.required_ruby_version = Gem::Requirement.new(">= 2.3.0")
spec.metadata["allowed_push_host"] = "https://rubygems.org"
spec.metadata["homepage_uri"] = spec.homepage
spec.files = Dir.chdir(File.expand_path('..', __FILE__)) do
`git ls-files -z`.split("\x0").reject { |f| f.match(%r{^(test|spec|features)/}) }
end
spec.bindir = "exe"
spec.executables = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
spec.require_paths = ["lib"]
spec.add_development_dependency "bundler", "~> 2.0"
spec.add_development_dependency "rake", "~> 13.0"
spec.add_development_dependency "rspec", "~> 3.0"
end