I now feel like every single thing I’m doing is wrong and will send me to hell, even things like putting makeup on or wearing a necklace.
So I’ve stopped reading the Old Testament and now half way through Matthew. Can’t say that I’m not freaking out a bit, feels like every word is condemning me.
Sounds like your struggling with self-condemnation? While 'fear' can be a motivation, it can also discourage a person who dwells on all their shortcomings. The beauty of Christianity is that we aren't in danger of hell fire because of our screw-ups. Have faith in the redemptive power of the cross, salvation isn't guaranteed to good people, but to those who constantly repent. Christ suffered the burden and penalty for what we do wrong, so he's your Savior, not your condemner. Remember what he told the adulteress; "Neither do I condemn thee" (John 8:11)