You should certainly not be working so hard to alter the pitch of your own voice, especially to the point of "tension" in your throat. In extreme cases, that could damage your vocal cords. At the very least, that doesn't sound comfortable! Regarding particular ways of speaking that some associate with lack of education or confidence, the first speech habits that came to mind for me were uptalk and vocal fry. You can search for a video on youtube that's called "Accent Expert Breaks Down Language Pet Peeves" and skip ahead to about 3:49 to learn more about the stigma associated with uptalk and vocal fry.

instead of reading strange articles -- check out voices and speaking manner of the most popular TV anchors (none of them murmurs prayers like you in your voice record)

Hi Ryota. I have listened to the recording of your voice that you have uploaded and the pitch of your voice is absolutely fine for English. Perhaps your are speaking low deliberately? If so, you could upload another recording with your normal voice and see what people think.

It is true that deep or low pitched voices are generally considered more attractive, and people with such voices tend to be seen as more capable and authoritative. This is mostly true of male voices, but also true of female voices to a lesser extent. However, this is a generalisation. David Beckham, for example, has a high voice for a man and has never been held back from success by it. By the way, the English term for whether a voice is high or low is 'pitch', not 'intonation'.