Geo Stone's book (you can find it in the stickied thread in this forum) rates various suicide methods on how suitable they are for suicidal gestures, as well as actual suicide... so you could do that, I guess.
Having said that, I don't recommend it. You'll probably end up in a psych ward, which is hellish, doesn't help, and will probably make life more difficult going forward. Not to mention that you could well be injured or in more pain (stomach pumps hurt like hell, and being intubated hurts for weeks, you can easily give yourself serious, permanent nerve damage or loss of motor control from cutting, etc). There's really no 100% safe way to attempt suicide, so you could well end up dead.
There are better, healthier ways to get attention or help or love or whatever you're actually looking for, so I'd recommend figuring out what it is you actually want and pursuing a better method of getting whatever it is.