when I bet on myself in bet room, I play and the result is a draw,,

but I didn't get my TC back, not only me but others as well

When someone has betted on someone in a match, and a draw occurs, the TC is sunken into the match.

Why you ask? The staff needs TC to be destroyed through things such as account personalisation, bounty text, name changes, usertitles and in this case, bet draws.

whether my TC can go back?

Nope, bets always have risks, and draws are one of them.

so sad