Are there unicorns in your "perspective"?
Yes.
How does your belief in solipsism affect your everyday life? I genuinely am curious.
If your belief in solipsism actually does change how you behave, then it
isn't useless, but every person I've met in real life that claims to
believe in it (admittedly only 3) behaves exactly the same as I would
expect of someone who thinks reality is real.
I'm going to address these two simultaneously since your premise operates on the misconception that solipsists don't believe "reality is real." Solipsists believe "reality is real"; solipsists just believe that reality stems from the mind and is controlled for with a logical necessity--i.e. as you mentioned, "cogito ergo sum" a.k.a. "Je pense, donc je suis," a.k.a. "I think, therefore I am." If what you consider physical or "real"--even your brain--can be characterized as noumena, then I repeat my question:
Can you control for the experience you have of your own brain, and the universe in which it functions, absent of your imagination?
What part of your experience, material or immaterial, can be controlled for independent of your mind?
To answer your question directly, my experience hasn't changed at all in the advent of my subscription to epistemological solipsism. Philosophy offers perspective; it's not a Stargate... or is it?
They are polite to strangers, care about politics, climate change, all stuff that under solipsism does actually exist.
Your understanding of solipsism is that it espouses impropriety, apolitical sentiments, and apathy toward climate change? How did you form such an impression?
As far as I can tell, it's like saying "blergle is true." They have a
belief in there head labeled that, but it doesn't lead to anything.
Where would you have it lead?
It doesn't inform other beliefs and isn't informed by any.
Not even Platonic/Subjective idealism?
It might as well not exist
But it does.