Yes, but not there because "not your keys, not your coins".

It's okay, you've got to have the initiative when investing. Even if you don't have that much, it's good that you're doing it with the little you have. Because what if you've got more? then for sure that you're not going to hesitate bigger amount in Ethereum. That's okay but if you're using Coinbase as your wallet to keep, better to use another wallet like MEW or mycrypto or any Ethereum wallet that allows you to hold your private keys.