Wallace was not included in Gordon Strachan's group for next month's friendly against Poland and saw 19-year-old Dundee United left-back Andrew Robertson and Sunderland full-back Phil Bardsley selected instead.
But Wallace does not believe the fact he is plying his trade in Scottish football's third tier should be a barrier to future call-ups.
He said: "I've never worried about it to be honest. You go back to the previous manager's comments that it would be difficult to pick players in this division.
"But I've always been professional, I've never taken the huff and I've never been too downbeat about it. I've always stayed positive and focused on my job at Rangers and on doing well.
"The new manager came in and said if you were doing well at that particular time, you would always have a chance no matter what level you were at.
"I took great confidence from that and the fact that I was in three or four of his squads. I will never get too negative on the situation."
Wallace praised Strachan for picking up the telephone and telling him personally he had just missed out.
He said: "He did give me a call, just to make me aware that I wasn't going to be in the squad this time around.
"Of course there is that bit of disappointment but I said to him I appreciated the call.
"I thought it was good management in the sense that he said I deserved a call, he was aware of what I was doing and I just missed out this time around.
"I've got a big game on Saturday, and big games coming up, so that's just what I'm looking forward to."