In general, I would recommend against it. You're 19, and you [probably] have no experience starting a company. Likely, the other founders haven't got much exp

In general, I would recommend against it. You're 19, and you [probably] have no experience starting a company. Likely, the other founders haven't got much experience (or success) either, or they wouldn't be offering a piece of their pie to a 19 year old kid -- unless that kid was a super-genius and was the key to making the whole thing happen. So ask yourself a few questions: Is having you on board the only way the startup will succeed? If yes, then ditch those losers and do something better. If no, then you probably should be finishing your degree as the sensible thing that normal people do. Most "entrepreneurs" work their entire life and are far more likely to create a stomach ulcer than the next Facebook. You might say, "Mark Zukerberg was a college dropout, and he did alright" but Zuck dropped out from Harvard. Dropping out from Harvard means that he got into Harvard, and it is not the same thing as dropping out of a public university. I'm not trying to be mean, but I don't want to see you lose some very valuable years off your life because you got caught up in a pipe dream. You didn't give a lot of detail about the start up, but this opportunity is likely small potatoes and is only exciting sounding because you are 19 and money seems a lot different to younger people. On the flip side, this could be valuable experience for you. Take a year off, and when the company is obviously floundering, ditch them and go back to school. If the company has managed to secure a billion dollar valuation, then congrats, you'll be rich. But don't stick around for a second year if the company hasn't obviously made it by that point.