This is honestly the most daunting thing any college student can think about before and during school. Somewhere it says that the average college student changes their major 5 times in 4 years, but where do you even start? Either you don't know what you want to do or your first plan isn't what you want/need anymore. When choosing your major there are a few things to keep in mind that might help your decision:
First off, what do you love to do? There has to be something that brings you happiness, whether its art, dance, accounting, human biology, something that just completes you. If thats what you want to do, do it, but sometimes what you really want to do isn't realistic or it wont make you a stable living post grad so you're freaking out because thats all you've ever enjoyed in life. If you can't do what you love, let it guide you in a different direction. Find a way to incorporate what you love and a way to make money.
Second, Think broadly and find a major that is malleable and applicable, something that you can go in a multitude of directions with. For instance you want to be an artist, but you also want to make money so you become a business major. BUT you concentrate in arts management. Arts management can be used in all kinds of places. You could work in fashion, in production, in animation, its so useful and its a way to express yourself creatively while making a stable income-- win win.
Third, there is always the double major. If you can't decide what you want to do and you have narrowed it down to 2 things, maybe try to go for both? Sometimes its not that easy because you want to finish in four years but if your classes don't overlap at all you're not getting done. But keep that in mind.
Fourth, there is also the minor. You want to be a dancer but you don't think you can make a career out of it so you become a communications major, dance minor. That way you can work in communications somewhere that is geared towards dance. You can use the minor to take a broad major and give it a more specific direction.
Fifth, always be thinking of your options. Sometimes thinking about your end goal can help you figure out your starting point. You want to be sportscaster so you major in communications with a concentration in TV production. That major will take you where you want to go but it also gives you a slew of other options if your first choice falls through.
Sixth, get creative. Mix and match majors and minors to get you moving in the exact direction you want to go. But don't stress about what exact job you want to be doing, those plans are going to change 100 times, so get yourself going towards something and then tweak your plans as you go along and as opportunities present themselves.
Lastly, talk to someone about it. A friend, a favorite professor, an advisor, any second opinion is good. Sometimes you're too close to think clearly and you're probably stressing about it so you need an outside take on it. Don't freak out too much, you have time.
Good luck.