Someone needs some serious help
The bike is not climbing the hills like it use too because of bad gas,,, wrong air/ fuel mixture,,, improper timing,,, flat tires with no air pressure,,, or the wheels are missing...
Not saying that a person might be dragging a boat anchor behind the bike,,, maybe some seized up wheel bearings...
Powering up a hill into a head wind could slow things down...
Lots of other factors too...
Oh well,,, at least the OP can talk to whom ever too sort it out...
Thats what really counts