>>1 you sound like you may have depression and although drugs and alcohol are a temporary fix, you have to make sure that you don't form a dependency on them. You need to realize your emotions, your sadness, anger, boredom, etc. and make peace with them. Figure out what's really hurting you and attempt to fix it. If you can't then find something productive to do, to keep you busy, like literature, art, music, anime, etc. Depressants, like alcohol and cannabis, will only make it worse, and I'm sorry to tell you that.
About your sleeping problems, you may want to see a physician for that problem alone for now, sleep helps a lot so if you're not sleeping well then it'll just be another factor making you feel worse.
A lot of people have those days, the days that we want to just disappear, I had some of them last week. But it does get better, suicide is never the answer, there are people that will miss you and will be terribly saddened, even if you don't realize that, there are people that care about you, we Dollars care about you, I care about you.
And it's not wrong of you to feel so good about numbing yourself, that's just another defence mechanism, everyone has different ones, for instances, I repress everything. It's pretty normal when you really think about it, however that doesn't make it healthy. You can talk to us anonymously here, we'll support you. I do recommend seeing a therapist when you're ready though, or if it gets any worse. I hope that this helps.