How to tell them?

I’ve been talking to this guy for six weeks now and I really like him and he likes me the same way. He been asking me on dates but I say no because I haven’t told my parents about him yet. My parents are wanting me to focus on my studies, and we really haven’t had that talk about dating. But when I do want to ask my parents I get nervous and chicken out. I just want know how I should tell them.