It is unfortunate that your family treats you badly but there may be little that you can do to change this. It might be best to continue to limit your interaction with them.
If I had the opportunity to interview you, I would want to know if you ever discussed your feelings with your family. If not, one option might be to tell them how you feel. They may not be aware of how you feel. Perhaps bringing it to their attention might help. If you don’t feel comfortable having an in-person discussion with them, consider writing them a detailed letter.
An important part of human development is becoming your own person. For some people, this can mean estrangement from their families. That can be an undesirable path but in some cases it is necessary for healthy psychological development.
It is important that you do not misinterpret the meaning behind your family’s actions toward you. In other words, the way they treat you is not a reflection of you. Rather, it is a reflection of them and the psychological problems that they may have. Their unresolved psychological problems might prohibit them from fully appreciating you or may limit their ability to express their feelings.
With regard to your medication, there could be a difference between the generic version of Zoloft and the name brand. Consult your doctor for further details. Switching medications might improve your symptoms.
If you continue to struggle with this problem, I would highly recommend consulting a therapist. A therapist could assist you in facilitating a discussion with your family. A therapist could also help you to navigate your family situation. Take care.