If you mean physically leaving Earth, it requires a spacecraft, trained mission support, and access to a launch provider
You cannot do it safely on your own without extensive training, equipment, and authorization
If you are interested in space travel, pursue astronaut training, aerospace engineering, or commercial spaceflight programs
If you are asking because you want to escape your current situation, contact a trusted person, counselor, or local support service right now
If you are in immediate danger or thinking about harming yourself, call emergency services now
If you are in the U.S. or Canada, call or text 988
If you are elsewhere, contact your local emergency number or crisis hotline immediately
Move away from anything you could use to hurt yourself
Go to a place where other people are present
Tell someone directly that you need help right now
Stay with another person until the urge passes