Wanto to bottom, but I'm scared about...

19 yo, almost virgin. I've always seen myself as a bottom, and I'll gladly hook up with some of the guys I've talked to on Grindr, but I'm scared about not being properly clean down there.

On the outside it's all done, shaved and smooth as silk. Figured most guys like that, but I'm scared that the situation is not the same on the inside.

I'm not really sure if I have the guts to buy an enema at a drugstore, I'm studying in a neighboring city so no one really knows me but still. What are your recomendations for an (almost) first time bottom in regards of cleanliness?

Also, feel free to give recommendations about what to do in the act or what guys like, I'm totally inexperienced and also afraid I might hurt my ass if I go too quick the first couple of times.