I'm not on board with a suicide command either, for the reasons mentioned in previous posts.
However, the options CodeMaster suggests, I don't suggest. If you, the player, are dissatisfied with your character, do NOT grief the game by intentionally trying to kill another PC. Because if you end up getting a lucky shot, you will have killed someone else's PC for purely OOC reasons (because you, the player, were dissatisfied with your character).
In addition, sometimes it doesn't turn out how you expect it to. I had a character, played for several RL months on a regular daily basis, and roleplayed myself into a corner and I was really just over it and wanted her gone. So I made my character "not likeable." Had her become grumpier and grumpier, argumentative, contrary, blaming other people for her foibles, intentionally not telling people things she was asked to tell them, etc. etc.
And after two MORE MONTHS of being stuck with this character I couldn't stand anymore, I finally sent her off riding (which was something she enjoyed doing all the time anyway), and allowed herself to be killed by two carrus (she killed the first one and almost killed the second, thankfully it got a solid blow in at the last minute).
If she had lived through that, the next step would've been going the other direction and letting the kryls get her.
Why didn't I submit a storage request? Because I just couldn't wait another day. I let it get too unbearable, and really REALLY wanted to play another character right away, mostly to get the stench of failure off my keyboard.
Although the staff really doesn't like when people do this, I personally feel that as long as it makes IC sense for your character to do something that will ultimately get them killed, they shouldn't be afraid to do it.