At how many citations should I make my Google Scholar profile public? I have recently got another citation, which brought my citation count to three. Even though I am proud of my three citations, others may find it funny or pitiful. So I am having doubts whether I should make my Google Scholar profile public and share my achievements with the world. Most profiles on Google Scholar I click on have over 100 citations. I will be lucky to get that many in 20 years.

I think the decision to make the Google Scholar profile public depends on citation count + several other factors. The other factors that come to mind are: my age, number of publications, field, level of the institution I am affiliated with, etc. 

I am 30, a young economist still working on my big paper, I have a PhD from a low level university in Eastern Europe, presently working at a not so high level university in China, but I have aspirations to make it to an average American or Western European university.

It seems to me that public Google Scholar profiles are for accomplished researchers and I should just wait for a decade or two. But what concerns me is that as I attempt to publish my next paper or apply for a grant or a job, the editor/reviewers/committee will bring up my profile on Scopus or some other portal, which will be missing some citations. In my case, Scopus shows two citations instead of three! I feel like someone must be laughing at this point, but I am sure even the best go through this stage in their careers.

Does anyone have an advice for me and other scientists with less than 100 citations? When do they usually open up Google Scholar profiles in prestigious universities? In not-so-prestigious universities? On your faculty?
As someone who is currently on a search committee for two tenure track positions in mathematics, I can tell you that "hiding" your profile certainly won't help.  In the job search process, potential employers are going to want to know about your research and its impact.  It's common to check on Google Scholar, Math Reviews, Web of Science, and similar databases to see what impact a candidate's research has had.  Many of the candidates for faculty positions that I've seen don't have public profiles, and in my opinion this makes them look weak in comparison with candidates who do.

If you don't have a public profile then someone trying to evaluate your research who looks at Google Scholar will probably find one or two of your most cited papers or perhaps find nothing and assume that you have essentially no citations.  Another possibility is that they'll find a confusing bunch of papers written by other authors whose names are similar to yours.  Having a public profile ensures that they'll see all of your publications and citations.  Even if there aren't many citations yet, this also shows that you're aware of the importance of documenting your research activity and its impact.