It is anxiety which is defined as "a feeling of worry, nervousness, or unease" so it sounds like what you have. Google TEA Forms and CBT Thinking Errors.
Use TEA forms and dig deep into the exact thoughts that make you feel in human, analyze them based on CBT thinking errors, and then check the facts to come up with a more balanced thought.
Anxiety thought: I don't feel human because I don't know what being human is supposed to feel like and I should because I am human. I am so hyper aware of myself and no one else seems to be. So because of that I must be crazy or there must be something wrong with me
CBT Thinking Error: Jumping to Conclusions, catastrophic thinking, Extreme Thinking
Balanced Thought: Philosophers, monks, saints and every day people have debated over the true nature of being human since time began. No one really knows the true answers. I will do more reading on various religions and philosophies and come to my own conclusions.
I went through this same exact thing and spent a couple of years reading to find that the religion I was born in covers the basics, so I just stick with those basic beliefs to keep it simple.
Also, I found the ultimate way to to keep myself distracted: find several positive mantras (prayers from the religion of you birth for instance, or a thought from a leading philosopher if you are an atheist)
Then every day increase the amount of time you say them in your head, say them, sing them, chant them to yourself, write them, read them. This can keep me constantly distracted. Google spiritual science chanting the name of God which is where I learned it.