A lot of flats of this type can be avoided by being careful where you ride. It sounds as if you are riding paved roads mostly. Try to avoid rolling your bike through grass or weeds to get to the pavement. In my part of the country this is how most road bike flats occur, picking up goat heads or grass burrs in parking lots and rest stops. Whenever I have to cross grass or weeds I pick up my bike and carry it to the pavement. If this isn't possible at least check your tires for burrs, thorns, and glass before riding each time you stop. Thorn resistant tires and tubes are heavy and add a lot of weight at the worst possible part of a bike. But you do what's best for you.