No confidence at all

So i recently got out of a really toxic relationship, where we didnt speak for a really long time, and now i have been having dreams about this kid i used to go to school with, and i think im starting to develop feelings, and we have maybe talkes once in a really long time, but thats it, he doesnt know i exist, and i wanna tell him, but need help, i have zero self confidence, bc i was bullied a lot and fear rejection, ive been in a toxic relationship an abusive relationship, and i just sont wanna get hurt, any advice on what to do?

This is me

And i dont wanna expose him so i wont put a pic of him