Yes, I'm alive!
Because I can understand your question and I often ask myself same question too. But the physiological aspects of life (senses, needs, reflexes) are the basic part of functioning, not life. I think that we are alive, because we have not found all the answers and life remains a big mystery and intrigue for us.
Our brain is a mystery, animals, plants are miracle, the universe is steeper than any fantasy.
Thanks for asking, by the way. Too much work and little time to remind yourself of life every day