Hey ladies

Me and my husband have been married for almost two year and we are both 30 with no kids (ttc).

He had been asking me to suck his dick and I am refusing but I really want to do it but I can't. I don't know how and I can imagine how disgusting it really is.

Is it too early to ask for those things in our relationship?

How do ladies over come the thought of doing this ? And tips or tricks