Is this paranoia? Imposter syndrome? Wondering if others feel like this

[Goggle787]

I work as a TEFL teacher for adults and honestly have days where I think I'm rubbish, but I think it's partly my personality.
I always prepare my lessons adequately, and it might just be that I have very low level learners so the conversation is more limited, but I genuinely think they find it boring.
I have an advanced class too and I do speaking, reading, writing, listening activities but I feel like sometimes they find it rubbish too. I really try to pitch it to their level and I ask them a lot of questions about their lives, where they're from etc. And I'm always smiling, kind etc. But some of them just walk out without even saying bye and never show any signs of enjoyment.
I had a small number of students,2 or 3, state that they liked the lessons so that's something i suppose.
I'm shy and

I posted too early!
I'm shy and I teach large groups of men which I find intimidating.
I'm sure I saw a couple of them laughing at me during the lesson, when I was younger I got bullied for having so called weird mannerisms, apparently funnily facial expressions and a slight lisp, weird movements etc.
I also blink my eyes a lot but I have no idea how to fix this.
Anyway all of the above makes me self conscious in groups and I feel my face going red.
When I'm speaking to the students I cringe at the sound of my voice and have no idea how to transition from one activity to the next without seeming awkward.
I've always had a slight suspicion that my friends found me a bit weird and awkward and felt sorry for me,but wanted to be my friend as they thought I was kind.
I haven't made any new friends as an adult in years. I have a partner and so i suppose I'm not completely unlovable, I just don't know how to fix the above.
I wonder if colleagues and new people pick up on my "weirdness" and secretly think it.
It's felt good to let this all out.
I feel like I need help of some sort.