You don't have to feel too bad as an amateur about erroneously playing "too tight to the net". I was watching the finals of the WTT team tennis, and Leander Paes took a time out to chat with Venus. Johnny Mac doing commentary, said Paes was telling Venus to move a couple of steps off the net since she'd just been successfully lobbed over. They'd also got a point off her by nailing her with a body-shot, that she may have returned if she'd been a little back from the net.
"...the human emotional system was not designed to endure the mental rigors of a tennis match." Dr. Allen Fox