Obsessed over fictional characters

This may sound very ridiculous to some people and I'm not particularly sure if this is where I should go with this, but I'm so sick of these feelings I have. I enjoy good stories from books or games. Once in a while I'll find a good one and slowly find myself becoming obsessed with certain characters and the joy I get from interacting with them. For example, I've played 2 visual novels recently, Doki Doki Literature club and Katawa Shoujo. DDLC really messed me up for a few weeks. All I could do nonstop is think about the characters and how I missed them. I even downloaded a mod to give the game a happy ending for some closure, but that didn't even work. I just grew to love these characters even more. With Katawa Shoujo I replayed it recently and I absolutely loved the girl who's romantic route I went through, Lilly. She has just been on my mind nonstop and nothing I do will satisfy my hunger for more content for that game. Just thinking about these characters I've grown so attached to can put me in a state of sadness. I am very confused as I don't think I am obsessed, because I don't do anything drastic (such as buy any merchandise and obsess over it or write my own stories and obsess over those as well) but I can't help but be so moved and attached to these characters. I'd literally give up anything just to live in one of these worlds. I am only 16 and I'm a male who is more or less lonely. I don't really have any people I can call true friends, mostly just acquaintances. I know this isn't normal and I just want a name for whatever this is.

sounds quite familiar, (fyi, male 30)

i describe my own as being genuinely, "head over heels" "disney fariytale in love"
with said fictional character

im highly empathic, i connect with the story and characters on a deep level
i would end myself to be in another world, and contemplate the concept of "reincarnation"
in this fashion daily
(i do categorize it as "suicidal" cause death is the typical method, i think of to facilitate this switch,
rather than something like a portal or simply "waking up" in a new life)

as a heads up/ warning, incase you havent experianced this before
youll want to know when to quit a certain fiction,
for me i want to be with certain charatacters moreso than be in the world (the world is a bonus)
so when i see my beloved character moving into a romance,
or something else that ruins the fantasy for me, i leave the show/book alone
and hold dear to my fantasy

sometimes you might wana know something extra about a character that isnt notable in the fiction
but you might find that detail in a wikia
i strongly advise against doing this yourself,
cause you may learn details you wouldnt wana know, like they get married, or assaulted
or go through a major personality flip

personally i dont have any issues with this fantasy keeping
or know if theres a "proper term" for it

i know the fantasies may or may not have adverse affect on my life
but those fantasies i manage to keep and not have corupted by my negative mindset
are the only semblence of a happy or content moment i have
so i keep mine close

Me too, I also get very attached to fictional characters. I feel right now it is a way of escapism, though.. When I was with my boyfriend (now my friend), I didn't experience this as I was too focused on those moments with him and rather my obsession went toward us (understanding his interests, planing dates and travels, and ways of growing together as artists or opportunities to 'help the world' - our mission in life). When we weren't together, as we were long distance for different periods, I did become obsessed in characters, which also helped me to distract myself and feel the absence less/focus on something different.
I work from home, so usually I need discipline to concentrate and do my work, but it is quite hard... That is the reason why I try not to start a new TV series, or book, fiction, whatever, because then I can't stop if the story is good or if a character called my attention.
I must say, probably I am more obsessed than you, as I do read fiction, have written for some for the characters, or have bought something (like some sneakers). But as I said, I feel is a way of escapism... For now I kinda portray myself in the characters, identify with them, and live their stories as if in a dream. Or, they also inspire me in some way, which may be, to find more knowledge, to be more into sports, more balanced, or something like that...
I don't know if you find it too, that maybe you find that fictional world very pleasurable to be in. Maybe more so than the outside..