ok, so i finished syncronizing my bitcoin core freshly installed wallet , since then, i guess it took 2 days,

here is what happend:
1. my final balance is normal, around 0.1 thank God!

2. i tought for some reason my receiving adress is my wallet , so checking the receiving adress i saw only limited amount

3. the bitcoin wallet seem to be sending to your change adresses amounts of bitcoin even if you dont do anything, i have transactions of -0.01 and right after +0.01 and so on , so i guess bitcoin core wallet constantly sends amounts to your change adress, i dont understand this exactly, but i don`t care tbh

4. my mistake was using electrum wallet (installing it, and having some old electrum wallet by default in it thinking is the same as the bt core wallet , i had no idea that the wallet has many adresses not just one (somehow i never heard of it )

 I want to thank every one of you that replied to this post, your words offered my confort , because i had to be away for few days then and i had no access to my pc, i felt violated and stupid , and buffled to have been robbed, especially since i am very paranoic when it comes to security and i also worked in cybersecurity, and i felt like a total idiot tbh. I also have a daughter, so i felt like i lost her money , since all i work for is for her future , so hers, so i felt even worse (and i had to attend a wedding and pretend all is fine, to my wife and her family )

so i had a nightmarish weekend because of this, but i knew best thing to do is not touch anything in such cases.

again, thank you all you all helped more then you ll ever know. <3