Worthlessness...?
 

It sounds like your family aren't exactly supportive of you. It's hard because if you're stuck living with them you have to put up with it until you're able to move out, but once you have moved out I suggest you see less of the ones who dis you. In the long run they may find they miss you and you weren't such a burden after all....

Because you're in an abusive environment tho it's hard to build up any self esteem, but you need to focus on your positives and try to be proud of them. Think of things you and only you can do. For example, maybe there ARE a squillion artists in the world, but only you can do a certain type of interesting curlicue doodle none of your friends can replicate.

I don't know if you're a believer in anything or not, but I am and for me I've found it can help. It's cliche to say, but I DO believe the old coffee cup adage that God don't make no junk. Religiousity aside, even if life is entirely random chance and we're only here the one time, it's imperative you ARE here, because only you can meet this combination of people in this timeframe, only YOU can create whatever art or support or friendship you create. There is no one in the world -exactly- like you. Remember that uniqueness. Use it. Even if you decide 'but I'm the weirdest/ugliest/most depressed/meanest/add-another-neg-here' you're still the --est of that. Empower yourself in that negativity if that's the only quality you see in yourself. Be the biggest, most badass whatever-you-choose-to-be and back down from no one.