Why does Aragorn become a ranger rather than go to Gondor?

I’m not sure if this is ever answered anywhere; but why does Aragorn not just go to Gondor to reclaim the throne? Books Aragorn always seemed to me to be very proud of his lineage, and desired to take up his throne. He also rarely withheld his real name from people, and if he did it was often revealed to them soon later. He even knew where Narsil was kept and had it reforged into Anduril, which I feel he could have done at any point given that it is his ancestral blade.

What was his motivation for not claiming his throne after being done with his training in Rivendell?

Edit: thanks everyone!! As someone who is newer to to being involved in the actual lore of LOTR and not just the films, I’m still building understand of the history.

And to the few who are saying this is basic knowledge that should be known- if you’re mad just don’t answer :/ you don’t have to come gatekeep or be rude. Be more like the many others who helped give an actual answer!