What is the point of living if I cannot be enough for anything or anyone?

I am 21F currently starting my 4th year in btech electrical engineering (I have no interest in it but I wasn't getting any college with my poor jee score so I just took what I got and I do sort of well like 8 cg)

but I'm trying to get a job in the it sector and I'm failing miserably. I'm a middle daughter and currently the financial condition at my home isn't great so I feel guilty even asking for basic survival money from home.

My mom's a school teacher and she's the breadwinner at my home, dad's unemployed and is a trauma for all of my family, he's been abusive, all kinds you can imagine to all of us. My elder sister has a job and supports my education and life too.

My younger brother is in class 12th and is my mom's complete focus. I've always had the fear of not being enough. My mom didn't want me they wanted a son so I'm just there.

I've always got everything less and now I know what I deserve, which is less in the best and the worst can be nothing so I get happy with less.

My boyfriend takes care of me but I always get to hear from him that he doesn't feel loved enough or I'm not doing the efforts I did for my 2 exes( both of them cheated and used me for my body and being my initial relationships in life I started doing so much for them to the point where my life revolved around them).

I am not able to make anyone happy by my existence and I am not useful to anyone. Why should I even exist?