Since I joined the crypto market. My gain is zero. I only have experiences and lessons. Does that have been called successful?

This is all right, I promise you. You have been in crypto for about three months. I conclude therefore that you entered during the month of January of 2018 or in December of 2017. Either way, Bitcoin and the rest of the cryptocurrencies were flying during those times. We are now staying below the prices of crypto during those times. Do not expect an instant gain. Your gain will grow from zero to more than double your investment in the coming weeks. Just don't panic and start selling your coins. Avoid that at all cost.