QTs is just not that good a hand.
Your betting behaviour makes sense if you have - with this table - done the same thing (ie) same betting pattern, with AA or KK. If yes, you have some sort of *reason* or expectation that your opponents will put you on a big hand.
That said, you are in $2/$4 land here. Most players will call down with anything.
In the long term it will lose money, but the worse thing is that in the short term, you could win a lot of pots, thusly fooling yourself that this is a winning method.
You are sentenced, for betting QTs with no regard for the math of the situation, to reading all of Paul Samuel's articles. Start with number one:
Paul Samuel Article number oneI am - of course - trying to be humerous with my "you are sentenced" and I hope you take it in good fun

and the reason I am sending you to the (amazing) Paul Samuel articles is that they will help most players improve fundamentally.
Hint: Have pencil and paper handy & give the articles the time, brainpower, and concentration they deserve. There are well over a dozen articles, all dealing with math & poker.
Hope this post was helpful! Good luck in your games!