Lately I've been feeling jealous of my grandmother and aunts relationship.
Why would you feel the need to be jealous of their relationship?
I think it's because I was never loved by my own parents and my grandma.
Being jealous usually means that you're not self confident, that you don't embrace your uniqueness and think you're not enough. Communicate with your family so that you don't feel the need to envy any other relationships they have.
I feel empty inside.
I know you had it rough when it came to your parents and your family life with them. With feeling jealous of a positive relationship about other family members isn't going to help that. I'd recommend seeking some therapy and they may be able help you out with these thoughts you have.