Yes, it's fine. There are actually three possibilities for negative tag questions following 'I am...'. 1. I am right, am I not? Correct, but the lack of contraction is quite formal. Often used in a jokey way. 2. I am right, amn't I? This form does exist, but it is very rare nowadays. You'll hear it in Scotland, but I wouldn't recommend you copy it. 3. I am right, aren't I? The best option. By far the commonest and most standard form.

Yes but you come off with a serious lack of confidence.

grammatically it is right