Anxiety Support Group
Anxiety is a physical condition marked by intense and persistent feelings of distress, fear, angst or dread. General anxiety caused by routine day-to-day stresses usually passes quickly and is experienced by almost everyone at one time or another. However, such feelings that linger over time and are very difficult to cope with, and which lack a clear cause, may indicate...

So being alone during grieving is a good idea.
You'll have heaps of years for friends going forward. They come and go. They're not your top priority. Your life and your future is your top priority.