Provided "as you want" doesn't involve anything that anyone would agree is absolutely destructive to your health, it's not at all selfish. It's how things are supposed to be.
If "how you want" means you like living it up with something like drugs and alcohol all the time (or else something that is more risky/potentially destructive when someone is younger than a certain again - and you're younger than that age); AND the "expectations of loved ones" are only their hope/wish that you won't get involved with obviously destructive things, or things that have a high potential of turning destructive.... Then that's a different thing. If that were the case then you'd be wise to "bother about those 'expectations of loved ones' because they wouldn't really be expectations. They'd be "sincerest hopes" for you to remain healthy and have a healthy future.
Having said all that, though, if anyone truly "expects" (rather than "hopes") that you live your life his way - that's plain, old, unhealthy and unreasonable.