Theres a reason top lane is called "The Island" because unless all the other lanes are doing well or you and your jungle plan to take herald early after dominating top, there is literally no reason to come top. Dragon, the more immediately useful objectives is on the other side of the map, also If i was a jungler (im a support main) i would gank bot to get 2 people ahead and have those 2 help me drag, instead of get 1 person ahead so i can get a few minute buff which will not be guaranteed to have any useful effect during its duration.
From there on really its hard for me to say man, generally if youre <50% HP you probably should back, keep your tri/river bush warded as much as you can and clench your butt cheeks if you dont have flash available.
Really if your jungler IS decent, he will go force dragon, get a gank bot/mid if their jungler insists on camping top, the best I can say here is that you hope your team takes objectives on the other side of the map because their jungler is putting pressure in the top half of the map, so they should do likewise in the bottom half, taking towers and objectives.