if i did shrooms once??

So my friends and I are thinking about doing shrooms. I was wondering if i did it only this ONCE in my whole life, and i was in a good state of mind, would it leave any negative effects? Like in the future would the stuff in my system hit me later in life randomly? If i had a bad trip would i be okay after it ends? and is it safe to trust a drug dealers shrooms they give me, i have bought weed from them and they got me good stuff but i dnt know them personally and is it possible they could give me a bad batch that could kill us? Thanks for the answers. Please don't answer with drugs are bad for you or anything, i really just want to try it once in my life.