Slight topic bump, hope you don't mind it too much guys
Mine is Sebastian as well, and for more or less the same reasons as Magically Clueless. I've also been through that feeling of being stuck in a life I couldn't enjoy, with no real way out other than completely restart from scratch (which I actually did). I've been through severe depression, social isolation, frustration and the like, and I absolutely feel his need for alone time. I'm the same: I love my friends and I enjoy spending time with them, but some says I just want to stay home alone. I don't think I'm as socially akward as he is (at least not anymore), nor as nihilistic (I'm more kind of pessimistic/stoic). But yeah, I' have no trouble putting myself in his shoes, since they're very similar to mine. Kinda wish I had as close a relationship with a parent as he did though. (I'm on good terms with my parents, but somewhat detached from them. If they want to talk to me, they have to call, I wont unless I need something.)
There's an event from another in the game that really resonated with me as well, and that's the 2-heart(?) event with Maru, where her father is all like "protect my little protégée with a brilliant future from anithing bad" or whatever. That's unfortunately the reason I cannot warm up that much to Maru, because she reminds me too much of a part of my upbringing I don't like. I cannot stand the "brilliant future" kind of nonsense, even on behalf of someone else, because it's that line of thought that drove me in depression in the first place. I've been considered a Maru since I'm old enough to talk. I've been an A+ student from the ages of 4 to 24, constantly praised for my intelligence and academical abilities, without much regards for the other parts of my personality. It just kind of became my whole raison d'être, and it had a huge toll on my mental health, until I deceded I had enough (it also certainly didn't help that I had an undiagnosed mental condition all that time). Maru fortunately seems pretty fine with her genius status, and good for her. Not anything against her per se, but she just embodies a large part of my life that I left behind because it hurt me a lot, and probably a bunch of other people as well.
Kinda interesting that I relate the most to those two diametrically opposite siblings.