I’m a 20 years old university student and I have m

I’m a 20 years old university student and I have my pregnant elder sis staying with me in my apartment cos of financial struggles her boyfriend’s encountering.Ever since she came, my life has been on a whole different level totally different from how I thought it to be cos she came for a “visit “ but has been here 3 months without even having an idea when she’ll be leaving. I practically do everything for her, more like I’m living for her right now, depriving myself of a lot of things for her to be comfortable but she’s never grateful. It’s always from one quarrel to the other something I never bargained for. I struggle to give her food 3 times daily and even buy her fruits for her condition but what’s eating me up right now is how she expects me to do everything for her alone. When I buy her something and buy for myself, she starts asking why I bought for myself and not her alone. Just today I prepared rice in the morning before leaving for school in the afternoon. I only ate in the morning then got back home 8pm before I got home, there was nothing in the pot for me to eat but I didn’t bother cos I bought oranges for she and myself in separate places so I gave hers to her and started to eat mine. The oranges were 5 for each person but she still had a problem with me buying for myself saying she’s carrying someone in her not caring that I left home since afternoon without food and those oranges I needed for energy before sorting something out for us both to eat this night even with all the stress I passed through and coupled with all these, my relationship is a mess right now I can’t even freely share my feelings with my boyfriend anymore cos he broke up with me. I seriously feel like I’m so useless and that happiness isn’t for me.