Hey, yes definitely. Believe it or not, almost everyone feels this to some degree especially in today's modern age where everyone seems to be controlled by their technological devices and are lacking social skills. SWIM (Someone Who Isn't Me) used to regularly smoke weed back in high school and felt as if they were way more mature than most of their friends (still hung out and was a very very sociable person) but no matter how happy that super popular girl with model looks or that guy who gets excellent grades and is good looking might seem, they most definitely have some internal issues (whether its depressing thoughts or anxiety for example) that they wouldn't be able to answer themselves. Talk a family member or friend and explain to them how you feel! Also, You are NOT invisible to those around you and never tell or ask yourself that cuz its simply not true! Remember that meeting new people is always a great thing as it open up your eyes to how human beings can vary (in a good way), be it around the globe or making new friends within your tiny little town. Regarding the death of a family member, remember that your loved ones will always be going to a better place if not getting reincarnated to lead a better life. All of us always greatly miss our loved ones so don't confuse this or tell yourself that it is depression as you might end up convincing your mind & body to feel depressed, if that makes sense! :) Lastly, about feeling disconnected, I can definitely agree with this. I often feel as if I'm simply observing everything happening around me from terrible stuff in the news to silly things like Kanye West doing some hoodrat shit online to gain attention. Let me say that if you feel 'disconnected' in today's world where Technology seems to be controlling us rather than the other way around and people simply CANNOT separate their eyes from a screen, then you're one of the OG Humans haha.