You wrote
Yes! (mistake, should be: I've never done it before) I never did it before
Correct
Yes! (fixed) I've never (fixed) done it before
Life experience: have you ever / I've never
3 mistakes
Para falar de experiências até hoje, sem data, o inglês usa 'have' + particípio: 'Have you ever seen snow?', 'I've never done it'. Com 'yet' também: 'I haven't watched it yet'.
To talk about experiences up to now without a specific time, use have + past participle: Have you ever seen snow? I've never done it. With 'yet', use the same form: I haven't watched it yet.
Ever, never, yet = have + particípio (seen, done, watched).
Wrong: Did you ever see snow?
Right: Have you ever seen snow?
Wrong: No idea, I didn't watch it yet
Right: No idea, I haven't watched it yet
Wrong: Yes! I never did it before
Right: Yes! I've never done it before
Yes! (mistake, should be: I've never done it before) I never did it before
Yes! (fixed) I've never (fixed) done it before
No idea, I (mistake, should be: haven't watched it yet) didn't watch it yet
No idea, I (fixed) haven't watched it yet
(mistake, should be: Have you ever seen) Did you ever see snow?
(fixed) Have you ever (fixed) seen snow?