I am sorry for the loss of your friend and for your isolation. From a purely statistical perspective, it is expected to be rare to find many others at the far right tail of the intellectual distribution, so individuals with IQs in the 160+ range are inherently more likely to be/feel isolated.
Some would be fortunate to be born into families with forebears who trail-blazed academic paths for subsequent generations. Tertiary and postgraduate studies often provide access to a wider network of contacts more likely to include field experts and/or brilliantly gifted minds with whom collaboration can bring mutually positive outcomes. It can be more difficult to find intellectually satisfying opportunities outside these networks.
There are several high IQ groups such as the Prometheus Society and Mega Society but unfortunately their entry pathways were compromised by internet leaking of answers to their entry tests, so I suspect they are no longer very active. As trite as it sounds, a possible option for you might be to explore any interests you may have and connect with people who have the same interests, rather than try to find social matches based on IQ levels.
