Muay Thai doesn't typically use a belt system. Or rank system, really. In Thailand, if you ask what your rank is, it's assumed you're talking about professional fighting. I know in Brazil, the Chute Boxe MMA academy had a belt-ranking system for Muay Thai, but it was run by a guy who started in Taekwondo, and adopted a ranking structure for that school. Still, most places that have a belt ranking system for Muay Thai are generally not seen as legit.

We don't know what your rank would be in muay thai as muay thai does not have a ranking system. We don't know your skill level. We don't know what the requirements for rank would be in your school if they had a ranking system. I've seen some stay the same rank for more than 3 years. I had one guy that looked like he was going to be a perpetual white belt. I was surprised he stayed that long with being promoted. He did finally earn a yellow belt after about 5 years. He was progressing at that point and earn an orange belt. He stopped training after earning an orange. He was getting better. But not closed to testing again. But I don't think it would have taken as long. Then we didn't see him any more in class. I did run into him one night on his job. He was some type of producer for a repertory theater. His job may be what kept him away. But I don't know. One of the guy that was an actor at that theater earned a black belt in our school. But he moved out of town to pursue a career in acting. He has come back once and trained with us when he was in town. He was back in town on business, not acting. He trained and we talked martial arts and what he was seeing where he was living.

The short answer is we have no idea of what you could have or should have for a rank in a sport like muay thai. Some one would need to judge your skill level not the time spent in training. Not all time is good time. Your skill level and knowledge and ability to apply what you are being taught are measuring sticks for rank.

If your instructor has no rank, then you can't have a rank either.

Your ranking is how many hours of work you put in, how much positive energy you have cultivated, and how much fight experience you have. That's all that matters for real martial artists.

Sounds legit. Ranking is a Japanese invention. Chinese martial arts don't rank either and neither do many other styles.

I've taken 7 years of private muay thai training (last year was 2010) my instructor never used a rank system but what would I be ranked as? Like belt and level?

My instructor was trained by one of the first instructors in the US and he never had a rank system when he was trained. FYI I was not trained to be an instructor.