Wedding Party Help

Not even once I haven’t mentioned to anyone that they would be in my wedding, I just decided my picks and still have yet to ask them. My fiancé’s best man assumed his girlfriend would be my maid of honor, we’re close but that’s my sisters spot. My three other bridesmaids would be my cousin-in-law, my fiancé’s sister and a cousin of mine. I don’t want to hurt anyone’s feelings. Do I just continue with who I have picked or have none at all?