[troels]

A lot of the comments here tells you not to get taken advantage of (financially) and how to maximise your worth etc. I don't think that's wrong per se, but I also think that may be better advise for someone a bit further in their career than you are. Where you are, I would say you should maximise for learning. That means getting to work with experienced people who are willing to teach you. By all means, make sure you get a fair salary, but make it a secondary priority when deciding what to do.

Regarding equity - Certainly ask for some amount of equity. That could never reflect bad on you as it signals a commitment to the company on your end. Keep in mind though that equity is a fairly long-term view. At 19, a 4-year vesting is eons away. There's a good chance you'll never turn those options into anything material.