Connecting to the Internet means either connecting to the backbone directly, or connecting to someone (an ISP) who can reach the backbone. I don't think a direct connection is possible for an individual---there's probably a minimum monthly charge which is way out of reach.
Even many smaller ISP's don't connect directly---they connect to a wholesaler (an ISP's ISP) who connects to the backbone.
But ultimately, to become an Internet Service Provider you have to provide (sell?) Internet connections to others.
Regards,
Henipatra