My parents have supported me in everything I chose to do, and thank God for what I call 'luck' because I ended up in a well enough situation that I will probably be able to take care of myself if I have to. I'd like not to have to be by myself, but if push comes to shove, I have that option.

That said, there will always be certain behaviours my parents would not tolerate. Without putting them on trial too much, let's just pick something that most parents would frown upon: excessive drug (illegal) use. If I became a junkie, my parents would probably be very sad, and try to save me, but ultimately may have to (sadfully) give up if it's that bad.

If your parents somehow will not support you for doing something, it's probably something akin to a life of crime of self harm. If it's something like a 'lifestyle choice' which I have phrased generally enough to mean anything, why can't they disagree but love the person? Either way, I haven't totally decided what it means to be a parent and dealing with an autonomous, self actualized adult for a child. I'd like my kids to take after me, but they probably (likely) will not (not completely, anyway). I'm a little like my parents but not totally.

Anyway, if you don't have your parents' support, will it really matter?