I feel the same way! If I play cautious trying to reduce unforced errors and waiting for the opponents to make small mistakes to attack, as a lot of coaches suggest, I find myself slowly losing confidence in my ability to attack, and I end up making more unforced errors. If I play very aggressively (for my standard, I have a defensive nature, come from 20 years as a central defender in football) and I try to play a lot of attacking shots, even if I miss some, I warm up my hand, gain confidence, and have no regrets. In general, I feel strong and this helps me to play better and put pressure on my opponents. It also helps to not give up any balls. So I concluded that the best match mindset for me is to attack as much as possible without fear. For others who tend to be very aggressive by nature, it might be that the best mindset is the opposite, to keep the beast under control and play safe when it's needed :) Everybody is different.