Feeling Like the Third Wheel

Dear Internet,

I recently started school again and two of my best friends from my class last year are in my class! Yay!
But recently, I feel like my two friends are avoiding me, or at least trying to hang out with each other more than they are hanging out with me.

Like in class, they always want to sit next to each other. And that's fine, but because there are only three of us, one of us will have to sit either by ourself or with an annoying girl who also came from last year's class.

They also chat to each other but hide their screens whenever I look over briefly. Or, they whisper to each other and deny anything when I ask just out of curiosity. I feel like they're keeping secrets from me or bad-mouthing me.

I don't know what happened. Did I change over the summer? Did they change? Are we seeing too much of each other?

I also feel like maybe they think I'm intruding on their friendship. They've been in the same class for five years now, but I've only been in the same class as A for three years (counting this one) and B for two years (also counting this one).

I need help :(

From,
Me

EDIT: Problem solved :D