Hookups? Tinder?

Currently in first year college and curious to get Tinder or hook up app. I would only have have sex with somone that I really know so one night stands wouldnt work for me (anything else im fine with). Im scared to get the app b/c 1 - scared other people I know would see me 2- it wouldnt make sense to get the app when Im not into one night stands... thoughts?