Ah, I see, that's also very common. Taken all the way it can develop into nihilism, which is one of the two extreme views in Buddhism [1]. I fell into that early on and abandoned my practice for many years. I found that once I found the Mahayana teachings on emptiness [2] and then the stories of the Vajrayana masters [3] the practice became joyful again and not bogged down by some narrow view of what meditation is.
https://en.wikipedia.org/w/index.php?title=Yantra