How to not spend way too much time in searching during software designs?

When software design tasks are given, I spend way too much time in keep looking for other wikis or resources to get information about similar problems.

I don't know when to reach out to senior engineers to get their input because I don't want them to think that I know nothing and how I even got this job. Even after some research, sometimes I can't choose an option over others despite listing pros and cons. I keep thinking about the designs all day and night till the design is finalized. How to take a break and allocate time when solving ambiguous problems?