I found myself in a developing carpooling situation as a daily driver.
My colleague approached me the other day and asked if I could drop him off. He doesn't live far away from me and doesn't expect me to drop him off at his place. Of course, I had to say yes and dropped him off. However, I can feel an expectation that this could be - even should be a regular occurrence.
To be fair, I am not changing which route I take to go home, etc. so I understand why he probably finds this reasonable to ask. However, I do have social anxiety and generally, terrible stress management. Even if I do not change the route I take to go home, it prevents me from making additional stops or plans before going home.
For many people this probably is not an issue but, I get stressed knowing that my plans (personal plans and after work) have to be in accordance with someone else's schedule.
Mind you, I absolutely do not care about sharing the costs or anything else that is material. This has become a burden on me, a socially challenged person, who frankly doesn't truly enjoy the company of the colleague either. I mean, having a professional relationship is okay, but I have people in my life I truly care about and I really do not want anyone else in my life in any capacity.
Hoping that I have not digressed too much, to my question; how could I go about this to stop this from developing any further without being rude to my colleague? For context, we are similarly aged and he is not in a hierarchically higher position, if anything, it is the inverse.
Addressing a question in the comments:
Just for clarify, how many times has this happened? Do you have any reason to suspect this will be a regular thing? It reads like you were asked once?
Yes, you are right, this has happened once. However, he mentioned anecdotes of other colleagues not picking him up on the road even if they saw him and how rude that was, or other colleagues driving him sometimes and how helpful that is, etc. So there has been a foundation of not having a car and its difficulties and the outright expectancy of the "help" of colleagues who have cars. That is the reason why I got stressed even after a one-time encounter.