Friend or Foe?

Apella • Living life & eating food.
so I've had these friends since high school & we all went to a Christian school then they went to a Christian College after graduation. I went to UIC. One of them "can't have me on snap chat" because her school is so strict & I "post provocative things". well last night, I posted a picture wearing ⬇️ ( I'm on the left) 
and one of the other "friends" in our group screenshotted if off snap chat and sent it to the other friend. When I asked her why she screenshotted it, she said "because I was trying to figure out what you had on". I'm like... why not ask me? You probably sent it to someone. That's when she admitted it, so they were basically talking crap. Then the other friend texted me early this morning saying that after high school I "turned" & she's "concerned" and she's not "judging". Mind you, we've had similar issues. on Halloween ⬇️ 
Whenever I want to do something, "it's a dumb idea" or something and I'm always wrong. I don't drink. I smoked... not even twice last year (Happy New Year!!!). I'm just fed up with the undercover shade. My mom's been telling me forever I shouldn't be friends with them, but I care about them. I don't know what I should do.