Do guys generally avoid deep conversations about themselves and their thoughts and opinions? Why?

You may have good intentions now but it will eventually come up. The minute a man tells you about his fears he gives you ammunition to emotionally abuse him. That's what women do when angry, they say things that hurts their man deep down, because they can't hurt him physically.

I'm a guy and I don't avoid the situation, I always try and speak to close friends about my problems, I've always done this because I didn't like the culture of keeping all the feelings and thoughts, its very unhealthy. Maybe this makes me more effeminate to behave or think in this way, but it has helped me so much and I'm not afraid to be humble and confess my feelings or thoughts to a close friend.

I think because in the pop culture, the man must be a super hero and must be this and that. There is a lot of pressure to fulfil this image. But the truth is a man does not have to be anything, or need to be anyone else. He can just be himself, love himself.

I hope that a woman will also love a man who is very gentle, soft and open to her about his feelings, after all, I thought this is a part of a healthy relationship and the woman will feel as if the man trusts her, which is a nice feeling.

I wouldn't push it on them if it's thier personality.
Might just be a matter of feeling comfortable enough to do so.
Some feel a little pride in figuring it out for themselves.

I don't open up much myself.

because women use that information against us later on...

It's not just the guys. Rather it's the person themselves. Some people choose to be realists. And some people choose to be escapists. 🙂

He didn’t say it but we’ve had similar conversations. He thinks men aren’t supposed to have feelings, that showing emotion challenges his masculinity. He’s very closed off, even with me.

No one likes to be judged and guys are more likely to hold back as protection. If I know and trust you I'll have those conversations with you.

Nah if anything I prefer to talk about something worthwhile than to talk small unless i'm having fun.

I don't. I encourage these types of conversations. However, a boy in a mans body will.

We are forever walking on eggshells these days in case we have the 'wrong' opinion.

Also, why is this in fashion?

With me it depends on the person.

Some of us are just wired like that. The "caveman" thing. Me? I'll talk your ear off.