Welcome to OpenStreetMap, we are a collaborative volunteer project. Mapping works best when done via a ground survey as there's so much that can be missed on misinterpreted from satellite or aerial imagery. Ground surveyed data is given higher preference, so it's great you're contributing here to improve the data in OpenStreetMap to better reflect the ground truth.

As for why your private driveway is mapped, see https://wiki.openstreetmap.org/wiki/Why_we_won%27t_delete_roads_on_private_property

If it's ever the case that emergency services needed to access your property or those that live further down the road, having these private roads mapped out may help.

Considering this section is on your property, you can also see https://wiki.openstreetmap.org/wiki/Key:access?uselang=en#List_of_possible_values on other possible access values and what they mean. eg. permissive (access granted, but may be revoked anytime), private (no access permitted), you can also further restrict my mode of transport depending if you restrict all modes include foot, or if you permit walkers but not vehicles, all possible to tag accurately with the right tagging.