if i was brought into life without my consent, why cant i leave life without the consent of others?

why is it so frowned upon to take your own life if the circumstances of your life make it unprofitable and miserable, or if your quality of life and functioning is quite low.

if it is acceptable for my parents to create my life without my consent, it should be acceptable for me to end my life without theirs.

edit: i should clarify that obviously you CAN technically leave, just not legally in most countries, and certainly not without facing significant hurdles. im talking about legal, free suicide options for anyone of legal age.