Hey popi, Sorry to hear that you’re in a tough situation with your sister. I think it’s important for you to understand that her comments and criticism aren’t about you. They’re about her. Like Samuel already says, it seems like she’s feeling insecure or unhappy and takes it out on you. Maybe you can have compassion for her about this. Understand that she’s behaving towards you in this way not because she wants to harm you but because she is suffering.
Of course this doesn’t mean that you should just accept her behaviour. Live your life and ignore her negative remarks. Do I understand correctly that you live together? That makes it harder of course. But do you keep your distance from her at university? Like Samuel, I’d suggest you tell her that her behaviour is hurtful and that you don’t wish to talk to her if she speaks to you like this. But show her your love and maybe you will seem less threatening to her and she may stop being so mean.

Hey C, like the others, I can also relate very well to your situation. I was in a very similar spot about a year ago. I was nearly done with my Masters and I had always loved being a student. I had contemplated becoming a researcher and loved university. But by that time, I was burned out, no longer enjoyed school and couldn’t get myself to do even simple tasks. At the same time I felt I had this passion for living a healthy and happy life and I felt I wanted to work with this.
What happened is I ended up completing my Master’s degree and taking some time off afterwards to reflect and discover my inner purpose. Going through the last months of my degree was painful and hard but looking back on it, I am very happy that I decided to finish it. Like SIngh said, the degree gives you a great foundation for whatever you decide to do and you had a passion for it. Once I graduated and I took some time to look after myself, my passion for my field returned and I actually ended up pursueing a path that combines both my field of study and my other passion of promoting a healthy, happy life.

I guess what I’m trying to say is that the love you have for biology and/or science may be temporarily overshadowed by the stress you’re currently experiencing. If you think that, deep inside you, you still value this field, I’d suggest you finish your degree and give yourself some space afterwards to gain clarity what you truly want to do. And allow yourself to abandon the path of research if it no longer feels right to you. Just listen to what you truly want. And it may just be a combination of art and biology. Like you say, you’re young, so give yourself time and allow yourself the confusion about what you want to do with your life. It’s hard to figure out and it takes time :). But you can’t end up in a dead-end, because you can always turn around.
All the best to you.