Shy and don't know when to give a bj

Maddie
Ok so I'v been wanting to give my boyfriend a bj for awhile and he wants  me to do it as well. we've talked about it over texts but I get so shy abd nervous that I don't ask when I'm stay over at his place how can I overcome that nervousness to ask him? It will be my first bj I'v ever done but we've had sex befor so i dont know why I'm so nervous