I was shoved into this world naked, filthy and screaming. It got a bit better after that.

Pick a weekend, go to a big city. I don't know where you live, but I'm talking Chicago or Seattle etc something like that. Over the weekend, go to a few museums. Do the "tourist" thing. Find a college that looks interesting, and since you are 21, go to the local college bar on a Saturday and watch football games with the crowd. Either get a cheap hotel/motel room or sleep in your car if that is your thing. GO TO MUSEUMS, seriously. Find museums that look interesting and go there, spend as much time as you want or can and see if something there grabs you. Then go home. If you are within 4-5 hours of a big place gas will run you $100, a room overnight will run you $50-$80 if you stay on the outskirts and say $100-$200 for food and drinks. For under $400 if you are stingy you can go on an adventure and figure out what you want to do when you grow up.

If you need tips on saving money, ditch cable and get Netflix to save $1100 a year. Stop eating out so much and cook/prep at home. Make a list of wants and needs, and learn to know the difference between the two and how to balance them out. And get a skill, a trade, or something that needs to be done that people are willing to pay you for. In most fields, nobody cares about who you are what you look like or what you believe as long as you have some hustle, can do the work and don't make life hard for your coworkers. Passions are great and all, but if it looks like your passion (if you even have one) can't pay the bills, then get a skill that does pay and make you passion your hobby.

And not knowing what you want to do with your life at this age is fine. I'm more than twice your age and still don't know what I want to be when I grow up.