Yes this is waswas from shaytan. Ignore these thoughts and do not pay any attention to your classmates when they are talking. You should have confidence in yourself! You should not be eavesdropping on their conversations anyway!

when I’m in the classroom when people talk within themselves I used to think they are talking about me, Is this from Shaitan?Please explain this for me.

Waswaas - Whispers of Shaytaan | March 1, 2017 6:42 am
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Sumtimes I cant perfectly say words like “lillahi” becuz my tongue gets tied. Also I don’t think I make enough shaddah on letters So, I have to repeat many times the aya and I lose focus and my tongue gets tied more It’s also hard 2 pray quietly because I don’t know if I pronounce correctly I wish to stop but Im scared prayer becomes invalid because I ignored these thoughts