Whether assisted suicide is legal depends on entirely on your jurisdiction.

Over here in Germany, assisted suicide is still a highly delicate matter from a legal perspective. Actively assisting in a suicide is straight up illegal, and even passively by just providing the means is at best in a gray zone. Despite our highest court having overturned the outright ban on assisted suicide, our various governments since this ruling have failed to pass any legislation on the matter.

As @vk6flab@lemmy.radio pointed out, there are so-called Advanced Health Directives, which in essence contains information for medical personnel on what to do in case you can’t communicate your will clearly anymore. Which i.e. can include that you do not want to be feed artificially and instead only request to ease the pain till death.

I would like to be a nurse for at the least the next ten years to help people.

Are you a nurse already? If so, you probably have access to a lot more and less traumatizing options to pass on than asking someone to shoot you.

Anyhow, I highly sympathize with your situation and hope that you still have many good and joyful days ahead of you.