I'm writing based on my personal experience with my relatively higher IQ and the great existential dillema. Don't discredit what i write if my examples don't perfectly match what you're feeling. It's really all the same question in the end.
I know exactly what you're talking about man. Seemingly crazy obsessive philosphical thoughts and ideas on the state that you're alive in and why you're here and whats the purpose and is this all an accident and if you're even really alive or what is life or what is consciousness or maybe what you call consciousness is just you being a biological computer and if there is a soul...etc.
I know exactly what you mean when you say: "but our body is in the present. every time i get aware of that i get panic attacks and my mind gets blocked and overloaded with thoughts and i understand that everything we do in present is associated with our subconciosnes"
You keep thinking and thinking and thinking and you wind yourself up into a panic attack and everything his the fan from there. Anxiety disorder, brain fog, hypochondria, depression, just a complete mental breakdown while trying to figure out this crazy thing we call existence and life.
I was a nihilist when this happened to me. I kept thinking about how irrelevant i was and how life was an accident and how we're all computers working on auto-pilot with no free will...etc until i felt the entire void of the universe crashing down on my head launching me into the chain i described above. The fact that i drank coffee which makes my mind go wild didn't help me either.

What helped me:
1) Understand that you don't know everything. You're 21, you're not even close. Somethings can't be "learned", even with a high IQ. They have to be "felt" and "understood", which takes your entire life.
2) "He who knows patience knows peace". Don't try too hard to find all the answers, because you won't. Again, you have to live through life to understand it, you can't understand life by just sitting down and thinking. You'll drive yourself mad. Its a process you go through, and IT changes YOU in ways YOU can't change YOURSELF.
My grandma lived through WW1 and WW2 in Eastern Russia. I remember when i was little i heard her say "When is death going to come for me. I'm tired of this already. I know it all, I understand it all, all my friends are gone, when is it my turn to go". I didn't understand how on earth she could say that then, and i still can't understand it now. I use that example to remind myself how little i know and understand about life. And i hope that when I'm old and falling apart i can be at peace like she was.
I've come to the realization that this world can't be fully explained through rational thinking. People have been trying since forever and we still have no clue. There are some things that your rational and logical mind just can't grasp, no matter how high your IQ is. Use this block that you've encountered as an opportunity to expand other ways of thinking you may have previously disregarded. Spirituality just as an example.
You're not alone, and the dilemma you're facing is something every intelligent person has faced in his life. And they all found that science, logic, and "rational thinking" only got them so far. Read other views. Read about other people's beliefs. Read about how other people live their lives.
Also, every person has basic needs in life. Socializing, playing, laughing, and sex. You're 21, make sure you take care of your basic needs before you stress yourself out too much thinking about the universe. Your body usually knows what it wants. Listen to it.