I just feel used at times I guess.
That is because you want something, other than what it is.
That feeling is valid to you, but not the truth.
Disregard anything that does not fit your discipline,
No need to categorise it. let it be.
If you want genuine postal use stamps, then perhaps collect covers.
with cancelled stamps?
Enjoy a hobby that satisfies all sorts of people in all sorts of ways, aims and desires.
Ornithology is a great discipline, lots to get your teeth into.