We don’t get to choose. That is ultimately justice, whether you accept it or not. It is human idea that we have to consent to everything. You do not ask for it to rain, yet it sometimes does- sometimes it’s good sometimes it’s bad. Really, idea you have to want everything around you in order for it to happen is ridiculous.
Again, does not matter. Why is it bad to be told you are evil and bad? Rejoice! Jesus was sent to people who are “evil and bad”- He was sent to save them! Seriously though, humans are not evil and bad just because of Adam and Eve. We take much more responsibility in that, but it is our choice whether we are bad or good.
No, you are not made feel guilty. You bear consequences. If your mother somehow torn all your clothes into shreds, would you be one guilty for it? No. Would you have nothing to wear? Yes. It is a consequence, not really guilt. Baptism cleanses us of that.
There was possibility they would not screw up. God did not create us to screw up, but gave us free will to do so. He had backup plan for every situation, though.
Many Saints were born with Original Sins (most of them). Yet they became so much like God that they now hold place near Him- and they could do that. It is possible. Why is idea that we have to work to be good and to get to our final destination (God) so terrifying to you? If you want to just receive without being ever tempted or tried, if you just want to be happy without ever needing to choose or sacrifice, you do not understand that God wants us to grow in faith. Same way humans reach obstacles in their daily lives which they need to overcome to grow and get stronger, we overcome sins and obstacles to get closer to God.
Why others? Most perfect Saints shamed and guilted themselves. If someone guilts and shames you, he just helps you with your job! Be grateful, because if someone does find error in you, then you can eradicate that error without needing to look for it. One great Saint once said that if someone criticizes him, he wonders “just this much? I deserve much more criticism for all my sins!”.
Ultimately, what is problem with is pride (trying to hide your errors and being ashamed and hateful if someone points them out) and sloth (wanting to be perfect without ever needing to do anything).