I've only played 12k hands. But here's my $0.02:
Since you've only played so little you really shouldn't concentrate on fixing a little leak like this. Odds of you getting dealt JTs are really small. I've only been dealt JTs 26 times during my "poker career" and I've lost some money with it. Another hand that's hard to play is QJs and especially QJo.
In an aggressive table you might be better off not playing this hand from early position. It's very good hand in multiway pots but it's not great if you are against one or two opponents.
To coldcall from late position you need to have at least 3 players in the pot before you or at least 2 loose ones. Keep that in mind.
If you want to study more about JTs do a search:
+"JTs" -"re:"
You could also download
pokerstove and do some experiments with it.