Not really sure. I can understand why he yelled at him. Guns are not for little boys. But I think Ben looks up to Dean and wants to know everything about him.

I think its because he doesn't want Ben to feel like him when he was growing up. He wants a normal life for Ben.

nope he was afraid and wanted what's best for him..

No, he was looking out for Ben. He yelled out of fear for him, like many parents do. He probably should have followed up with a more in depth discussion with Ben of his fears and why he doesn't want Ben to follow in his footsteps but come on. It's not like Dean had the best parental example in John. He wants to keep Ben safe but he doesn't want him to grow up in fear like he did. It's a fine line and Dean doesn't have anyone to help him figure out what the best thing to do is. I really feel for him.

He wanted what best for him..
he wanted him to live normal and not like how he lived!! oOoh baby :(

I dont think he should have yelled but I also understand why he did. He is totally stressed out and is trying to make sure he doesn't fall in his father's footsteps. So yeah maybe he should hav tried to take a breath and relax and explain to Ben his reasons but in that moment he was to stressed out.

I don't think he should have yelled, but Dean isn't perfect and he wants what is best for Ben. He doesn't want to raise him to be a hunter like he was raised, even if Ben thinks it is cool now, Dean knows what it will do to him in the long run and that scared him.

Okay, Dean yelled at Ben because of what Ben was doing. And especially when Ben began to talk about being just like Dean. Dean doesn't want the hunter life for Ben so that scared Dean to hear that coming from Ben.