> Being happy and alive for 20 years

You're not thinking this through thoroughly.

Being "happy" can be achieved with anti-depressants and being "alive" can be achieved by essentially turning you into a vegetable.

You're happy and alive, yet I highly doubt this is what you had in mind when you wrote that line. You clearly want more than just being happy and alive. You also want to be free and an individual and have an impact on the world and all those other things humans want .. but sadly often times you can only have less and less of those as you grow old.