In case anyone is wondering i had all this backstory when i made the charcter and ommited a lot to make it not ridiculously long
It's okay, man, everyone writes a sue at some point. Some of them even get regularly published.
Sometimes, sentiments like these are what make me anti-anti-sueist. I really don't mind trying to better the quality (believability, etc.) of player characters, but sometimes this is bordering on, ah, "witch hunts" and "mass repressions". Should it really be this harsh?
Like any pejorative term, Mary Sue tends to get thrown around and stretched to the point where it often doesn't mean anything in particular. And like any pejorative term, if you find yourself getting bogged down in semantics it's better to just abandon the term and continue to argue the point. Not being willing or able to do that tends to be a bad sign.
So what exactly is mary sueish about my character? I took the test and she scored pretty low actually
Honestly, not a whole lot. The concept of a Sue is a bit complicated and scattered, but the basic idea is narrative superiority- the author and world both seem to like them too much. Your character has kind of a lot of features I tend to see in poorly written, not terribly imaginative characters, but I wouldn't call her a Sue.
As an example of a Sue-ish quality, you have a tragic and poorly explained revenge story against a completely unlikeable enemy. Your parents were brutally murdered in front of you by someone with no redeeming characteristics or plausible motivation, thereby highlighting your struggle against adversity, establishing your moral superiority, and possibly justifying questionable behavior or unusual traits (paranoia against allies but it's justified because trauma, running away from danger but it's justified because trauma, etc).
Which doesn't make her a Sue, but it's an example of a Sue-ish trait. Or, more directly, a trait that implies that she's supposed to be special and better than everyone else, even if "better" refers to fairly nebulous criteria.
Other examples include her unusual appearance, unusual homeworld, the fact that she's one of the only fully sapient beings on her own world (ie she was special even on her special planet before her special backstory), the importance and power of the person who wronged her, and, uh... actually, I'm not even going off of your official backstory, I'm going off of the blurb you posted above. Hm. Maybe there's more Sueness elsewhere.
But I hope you get the idea- the character is special in a lot of sort of hamfisted ways. I think that's more a result of inelegant writing than proper Sueness, but as a quick acid test- imagine a room full of people with loosely similar backstories, and ask yourself how much sense it makes and what it tells you about the universe. In this case, wow- there are a
lot of weird-ass planets with only a few proper thinking humans on them, and apparently the people running those planets are complete dicks against those people in particular.
Which isn't necessarily implausible, it just doesn't fit ER very well and, again, tends to look worse when it's less elegantly put.