Parents found my twitter?

[Amy]

Well, not so much BOTH parents, but my Dad did. My mom knows I have a Twitter because every now and then I mention something a band member tweeted or what's trending (for example, the other day when Amy Lee tweeted this picture, https://twitter.com/AmyLeeEV/status/4047...40/photo/1 , #EvanescenceNewAlbum was trending for HOURS and I told my mom about it trending and asked if they go on tour next year if she can get tickets, etc)
I'm about to be 15 and I cuss a LOT in my Tweets, I follow Illhueminati (organization that has members who write poetry, etc) members' Twitters and some of them tweet sexual things, etc. I follow a lot of bands that my parents don't "approve" of, I have quite a few Satanic Norwegian black metal bands listed in my bio, I post pictures of King & Gaahl from God Seed/Gorgoroth, Pelle from Mayhem, etc. The photos of the band members I've tweeted pictures of show that they are in a black metal band. God Seed follows me back on Twitter, and my mom knows about when King and Gaahl were still in Gorgoroth, about their concerts, crucified models, pentagrams, upside down crosses (when they don't mean anything Satanic), goats' heads on stage, their Black Mass Krakow concert in Poland, etc. My parents are Baptist and they don't like bands that use Satanism in their music, and they don't like black metal AT ALL. They despise it.
I'm Baptist as well, but I don't really care if the bands I listen to are Satanic or not, but my mom thinks that if a band I listen to is Satanic or involved in black metal, it will make me a Satanist as well, when it will not.
My dad has been following me for quite a while without me knowing until a few hours ago when I searched his Twitter to see if he was Tweeting anything about the Alabama-Auburn game, and it said he follows me. I don't guess he paid much attention to anything I've tweeted because he hasn't brought Twitter up in a conversation with me at all. I put my account on Private a few days ago, so I blocked my dad so that he won't be able to follow me or see my Tweets.

If, for some reason, my dad brings my Twitter up when he's talking to me, what should I say if he says something about the black metal, cussing, accounts I'm following, etc?
Also, I've tweeted about my depression, anxiety, suicidal thoughts/tendencies, etc and NEITHER of my parents know about my depression, anxiety, or suicidal tendencies. I don't need them knowing about any of it because it would worry them both, but mainly my mom because my uncle (her brother) committed suicide in July and if she knew about me being suicidal and my depression, it would worry her to death and I don't want her to have to worry about anything more than what she already is worried about.