Having fear in the heart is a blessing, inshallah. As for the questions you have asked, one simple answer cannot be sufficient as it has many queries. Instead of trying to provide a separate answer for each question you have asked, I believe a holistic approach would be better.
The first and foremost thing we must understand is that,
Allah azzawajjal said Allah does not obligate anyone beyond his capacity.(2:286)
It is reported by our beloved prophet Muhammad PBUH,
on the authority of Abu Hurayra(RA) who said : I heard the Messenger of Allah say : What I have forbidden for you, avoid. What I have ordered you [to do], do as much of it as you can.(bukhari and Muslim)