The Schengen rules are a rolling window. You can spend 90 days out of every 180 days outside the country of your long-stay visa. Today is May 14th, 2021, so visits before November 16th, 2020 do not matter any more. Tomorrow, the window will be November 17th to May 15th. The day after that, it will be November 18th to May 16th.
The visits in December and ...
I'm now 18 and I'm wondering if I still get the penalty for overstaying in the U.S for over 180 days even if I was a minor.
The accumulation of unlawful presence for determining statutory inadmissibility does not include periods of overstay when one is a minor. See 8 USC 1182(a)(9)(B)(III)(I):
No period of time in which an ...