I would suggest to talk to your advisor. Just tell him exactly what your are telling us:

you think that your thesis problem is not meaningful nor interesting and too technical.

If he displays as an answer some kind of rude behavior, then I think that it's better to change from subject (and from advisor). But my feeling is that you can have a constructive discussion with him. He must first understand what you don't like in your subject. Then he may propose a less technical question or a different angle of attack on the problem. He may explain the relevance of some technics that may appear boring at first sight, but that you will find both enjoyable and powerful as soon as you master it. Just as many mathematical courses don't reveal all their depth in the first sessions, there may be many wonders that await you in the next years of your phd. But some tedious work may be in order before reaching that point.