Sitting on potty but won’t go on potty

JK

Our son is constantly sitting on the potty and will sit if we count to 30 seconds and given a reward of 2 teddy grahams after he sits on it. We’ve been doing this for a couple weeks and he still hasn’t actually gone on the potty. He actually seems to be holding it then gets really upset if he almost goes on the potty but will sit there if we count and for the teddy grahams. He keeps having accidents in his undies then... many accidents. He also constantly puts his hands down in the potty and grabs his privates while sitting there. I’ve tried giving him something to play with or hold toilet paper but it’s almost like he holds his private and nervous to go in the potty :-(

He is over 3 and def knows when he has to go and tells us he did an “ew” and shows all signs he is ready to potty train.

We’ve also tried having papa show him how a boy goes and talked about it in books and all

Would love any advice, thank you so much