[SOLVED] Constructors with unexpected default values

Hi all. I am relatively new to coding and game development, and i'm working on a little project that i'm letting grow small step by small step. It is a Tile-TurnBased chesslike game.

I am having some sort of "silly" problem with constructors and I really can't get to decipher C# MSDN guides.

In particular i have two problems: 1. i have my Tile class which is:

 public class Tile 
 {
     public int dimensioneTile;
 
     public int xRel;
     public int yRel;
 
     public bool tileOccupata;
 
     public Tile(int _xRel, int _yRel, bool _occupata)
     {
         xRel = _xRel;
         yRel = _yRel;
         tileOccupata = _occupata;
     }

(tileOccupata is a "isOccupied" sort of bool) it works actually, but since all of my tiles "are born" empty I would like to have somthing like:

 public class Tile 
 {
     public int dimensioneTile;
 
     public int xRel;
     public int yRel;
 
     public bool tileOccupata;
 
     public Tile(int _xRel, int _yRel)
     {
         xRel = _xRel;
         yRel = _yRel;
         tileOccupata = false;
     }
 }

Where the variable already stores the information of being "empty", but if i code it like so it stores it as true, ignoring my line of code saying "tileOccupata = false"... this is not the behavior i was expecting.

My second problem is similar but slightly different

 public class Eroe  
 {
     public string nome;
     public int Strength;
     //i want health to be Strength * 2
     public int Health;
     
 //constructor
 public Eroe(string _nome, int STR)
     {
         nome = _nome;
 
         Strength = STR;
         Health = Strength * 2;
            //i  also tried Health = STR * 2
     }
 }

in both cases Health turns out to be 0

So my actual question is: do i need to have a parameter for each variable i have in my class for it to be actually initialized at a different value than 0 || true? How can I do it?

Thank you for your help