I bet you are a fairly young person. Young people tend to have a hard time really believing that life won't just keep going on and on.

The truth is that you are not immortal. Someday your life will be over, though probably not anytime soon. Your attempts at suicide didn't result in death because either the means wasn't lethal enough, or you were given medical attention before the method could succeed. Most likely, you are deeply unhappy, but not entirely sure you want to leave this life. It may be that you want to communicate/express your profound dissatisfaction with how your life seems to you.

I'm sorry you feel this bad. It must be awful. Get yourself whatever support you can. Therapy might help you to turn things around. Life can be pretty miserable at times. But you have more power to change that than you are giving yourself credit for.