Kudos to the fact that you are 22, gainfully employed, and don't live w/Mom and Dad
Double kudos that you are EVEN thinking about investing at your age. Your peer group is taking selfies from Mom & Dad's basement and sharing useless shit from BuzzFeed.
That being said, what you should do with the BMW really depends on why you bought it in the first place.
1. If you bought it for a status symbol, to impress the ladies, or your buddies - ID sell it. There are always going to be people with more money than you, and if you try to keep up with them, you'll be making poor financial decisions. If you are impressing the ladies with the car, you're going to attract girls who want you to buy them shiny things.
2. If you are a true automotive enthusiast, then what the hell! Just don't wear a BMW hat please.
If I was you, I'd sell the BMW and eat the loss as a lesson in personal finance.
Since you are on the MMM website, it makes me think you are an intelligent person. If you do keep the BMW, see if you can make up the extra costs in other 22 year old ways, such as: Less jagerbombs for 10 of your friends, dining out 20 times per week, buying fancy clothes, etc, etc, etc.
Good luck!