A Collection of Privileges
Travelling is not something to be taken for granted. Travelling, or more generally speaking freedom of movement, can be limited or made completely impossible by many reasons.
Health reasons
The most important pillar of travelling is probably this one. If you do not feel well or are physically restricted, travelling is difficult or impossible.
Family reasons
Here the question is whether you can afford to be absent for a longer period of time. Do you have explicit or implicit obligations, such as caring for relatives or a pet?
Financial reasons
Like almost every other hobby, travelling costs money. Money which first has to be earned beyond the normal costs necessary for survival. This is more difficult in some places than in others.
Political reasons
Travelling can be denied to a person. Because there is a risk that they might flee, or because there simply is no authority that issues the necessary documents. Be it passports or visas.
Social reasons
Travelling has undergone an interesting development in recent years: on the one hand, especially in Western countries, it is considered completely normal to take at least one long-distance trip per year, while on the other hand certain types of travel are put in the dock, whether because of high CO₂ emissions or also in order not to support or strengthen the local government in its actions. The latter in particular seems to overlap strongly with the political reasons, but it is still only intrinsic, because everyone is free to take these things into account, to ignore them, or precisely to perceive and observe them and make their own decisions.
So one only travels if all five are fulfilled at almost the same time or if one can fulfil them oneself. As soon as one of them is not fulfilled, it becomes difficult. Some of the privileges shown above are harder to obtain if, for example, you live in Cuba or Uzbekistan. Then the financial and political reasons become almost insurmountable, while one has probably never even heard of the social reasons. If, like me and many others, you have been given a strong passport, political restrictions are almost invisible, or a visa costs at most the equivalent of one to three hours of work.
Travelling shall therefore never be taken for granted, and that is exactly why I personally make use of it as often as I can, because I am aware of how fleeting it can be.