I believe in mind control.

It's easiest to control yourself so you could say that controlling others would be indirect but it's still controlling others.

All such beliefs I developed from a young age. It's not unreasonable. It's just unreasonable when it conflicts with any basic assumptions you have about the mind and reality.

It only becomes a problem if it has a disproportionate importance in your life. That's what makes it delusional.

But it's much better than believing you are controlled by others or others can read your mind. I would say that's a logical next step. If you think you're better at it it's more manic and if you believe (some) others are better at it it's more incongruently (supposing mania is the norm) and fearfully psychotic.

If you tell others about it without being specifically asked about it I would say it's (at least) manic and maybe too manic (since it's so important to you that you divulge a secret you would probably otherwise keep). It's unlikely you fear being controlled or you probably wouldn't say anything at all.

Congruent delusions could become incongruent. So if it's of delusional importance, there might be a problem. Of course just delusions of grandeur can distract you from things which are (also) of (practical) importance.

But you can believe it and even make it part of your belief system and not be delusional.

Have you always had this belief?