Question about ?

hello.. im 21 and a virgin.. and now wanna have with my boyfriend.. but i always wonder how can i be sure that there is no, errr,, poop inside first .. because it'd be really embarring .. i know some people says to use enema.. but i feel like im gonna faint everytime i hear about it.. and others say to put ur finger in and make sure, but actually i don't want the first thing to go into my to be my finger.. any advice ?