If you didn't sell your coins you are not in loss. Yes, you had chance to sell it when it was in high price, but you didn't do it, so there is no need to regret it and to count how much you could earn.
Yeah, if you sell when you're at loss you'll never have the chance to recover although sometimes cutting your loses is the best option but that's rarely needed when you invest in top10 coins. They fall but they also rise again.