I live in an apartment with 4 girls, me and another guy. The girls are hot and friendly but I don't know what to do...I'm not good at pick up chicks.

One of them, a hot blonde 19yo east european girl (polish) arrived last week for the erasmus and she's giggling at me and chat me up all the time but I don't know what to do....I don't feel at ease and I'm afraid I come across as socially awkward...any help is appreciated