Some very important questions you have to ask are:
Is it physically safe to come out?
That has to be your first priority. If you are concerned that friends or family will try to harm you, then it's best to stay closeted.
Is it financially safe to come out?
That has to be your second priority. Would your family withdraw all their financial support? Would they kick you out of the house and disown you? Do they contribute to your education? You do not want to end up homeless and you can't sleep on friends' couches forever.
Is it emotionally safe to come out?
Can you deal with all the rejection you're expecting? Is the worst possible scenario so frightening that you couldn't deal with it and stay in school if you even had a school to go to?
If you're coming out and expecting serious consequences from doing so, then you have to plan for what will happen afterwards. So long as you're financially dependent upon your family you cannot deal with them from a position of strength. They will not see you as an independent adult, but as their teenage child. That means they can take away things from you that you need to live in order for you to behave the way they want. When you're out living and working on your own, there's nothing to take away but their love. They can't threaten your security.
Whatever you decide to do, make a plan for what the worst consequences would be. Have a backup plan so you know that if their support is taken away, that you'll have a safe place to go, food, and some clothing.
I suggest seriously considering this before going ahead with it. Coming out is tough but it is a lot easier to do when your loved ones can't hold over your head those things you need to live on. College is very important and you may never get an opportunity to go back to college if you lose it now.
Think very, very, carefully before you act; particularly when so much is at stake. It may be wise to postpone coming out until you have realistic alternative plans.
Good luck
