Nothing is important to me anymore?

To me nothing on this planet has any significants whatsoever in the universal spectrum, even this galaxy, the milkyway is insignificant humans, we think we are overwhelmingly important however we are not we don't matter at all. Thats were my problem starts, because of what I have just told u I am beginning to lose the ability to enjoy life or do anything etc homework getting good grades good job, everyone says that's what u have to do in life but I think it is so unimportant! I don't care about global warming or wars going on I don't care about anything anymore I'm a teenager can anyone relate to what I've said? Basically nothing is important to me anymore, everything is insignificant, people are the only important aspects of my life right now. I don't really care for having a "successful future" I'd rather have piece of mind.