It's becoming too much to handle?

Best thing would be to find someone from a school or somewhere around town that will offer free counseling for situations like this. If people are coming to you, that's a compliment because they believe you to be a rock, a person that they can talk to. Now you need a rock, someone to talk to that will help you vent all of these frustrations that people are putting on you. Not to mention that even though they are your family, it's really hard to be that person that everyone comes to with their problems. Maybe they don't need you to do anything about them, just listen. You can also take that opportunity to tell them how you feel and make the situation a little less one-sided. If none of those solutions work, then you just need to calmly tell them that you are dealing with this as hard as everyone else, and you would rather them not talk to you about these things. I know it sounds really corning, but talking things out with people seems to be really underrated these days. You are good in putting your needs behind others, but it's situations like this where you find yourself overwhelmed that you need to focus on the most important person right now: that is yourself.