That depends on you friend. If you are making this post then it would indicate to me that you're looking for outside validation which implies that you have doubt, meaning that you perhaps know or have a suspicion that 19 is very young.
If you want my opinion, then yes, 19 is very young. Life doesn't really start until your late 20s. That seems like a ridiculous notion of course, but a significant portion of your maturity and life experiences happen at around about your age. I was the same at 19. I'm now 32. I have a wealth of experience behind me. Girlfriends, friends, jobs, education. It all came and went and I learned from it. As people get older, a lot of those high school prejudices and cliques that make you feel inadequate cease to be.
What you feel now is not eternal. My advice and opinion is that you live some more. If at the end of that you feel the same, then that is a choice you can make. Trust in time and be kind to yourself. There are many here that will encourage you to seek the end, but they're just playing devil's advocate to validate their own weakness. I'm telling you to develop your own strength to make your own choices. I'm telling you to empower yourself so that whatever choice you do happen to make, life or death, it is yours and yours alone. It is your path. Your journey. Your struggle. If nothing else, you can say it is yours and that is something that no one can take from you.