Ye indeed Olegan, you are playing way too few hands. Hand selection is a really important thing in poker, I think most beginning and intermediary players lose money here. To build a good opening range I advise you to use PokerSnowie you can download it for free and create a free 30-day trial. But also you could just watch youtube tournament analysis from people like Gripsed https://www.youtube.com/user/gripsed.
He has lots of good training videos and in the videos he explains why you should open or not open hands.
But there is way more to consider when opening hands. You should also take into account your stack in big blinds and the stacks of the people behind you. And you should think about whether they will reraise you etc. In general you should be willing to open a lot of hands when u are in position and avoid situations where you are out of position like in the small blind. So in general from the first 3 positions you open really few hands and when you get closer to the button, than you can open way more hands. But a profitable range can be found on the internet.
I would like to give more advice but I really have to few information about your playing style etc.