Would you be a colonist on Mars if you could never return to Earth?
The Martian Mayflower ship contains a couple of hundred people - you won't be too lonely
You will only be able to take a spouse and any children under 18 you already have. No other family.
The chances of success are high, but not certain (more than the original Mayflower at least!)
You cannot ever return to Earth. It's a one way ticket.
You cannot communicate with Earth instantly. There is a 4 1/2 minute communication delay - so no phone calls from Earth, though email is possible.