anyone who tells someone to kill themselves clearly doesn't think straight and isn't a genuine person to begin with. you're very pretty and there will always be people that are there trying to crush your self esteem and tell you you're worthless, but you're not.
I think you look very pretty. A smile will boost your attractiveness. Do students actually say that awful stuff to you? Damn. Well, you need to tell them to go F themselves because you are not going anywhere. You will continue living your life and focusing on the future you are currently dreaming.