Crows feet happen at the corner of your eyes, not under them.
You're likely dehydrated, and it's an exaggeration of fine lines (we all have fine lines!). Get a good hydrating cleanser, moisturise and use sunscreen. Watch skin care influences on YouTube too (Dr. Dray, Cassandra Bankson, Hyram, James Welsh, etc.). Reddits r/skincareaddiction is good too.