You're really the only one who can answer that. But I think if you're asking this, you're unsure, and you need to be 1,000% sure about this. Suicide isn't an emergency. Death will always be an option, but you can't ever change your mind and come back to life.
My opinion is you should give life more of a shot first. At 19, it's only really just started, and it's not magically easy. I don't doubt you're hurting, but I think it's too early to tell if things aren't going to get better. Friends and relationships aren't impossible, but they do take work. You're finally old enough to really be in control and do what you want with your life. I think you might as well try it out.