Hello Galaksi,
Your problem isn't uncommon, you just need to take more time and analyse your position better before making the move, "if you find a move look for a better one!". You can also take notes of your time, every 5moves write how much time you're using, This will help you use your time better.
Here is a book which would really help you:
Chess for Tigers (Batsford Chess Book) by Simon Webb
hi guys, you know some timse when i play chees i meak many mistakes and i dont know why , today i lost many gams with people which are lower then me in points ,, i lost 6 tims :( ,i dont know but shoult be a opsion which shoult say are jou sure for this mouve ( yes ( no) because some mouvse are not incorrect and you think is correct , i dont know but i make many misteaks.