At this stage, your kid will find it a little uncomfortable to engage with adults other than parents and a few near and dear ones. A broader and wider adult circle is missing in most cases and kids like to keep away. But this is the apt stage when he can start expanding his social circle, which in return will boost his confidence and communication skills as well
What you need to know
Kids do not understand adult talks and adults can't run around and play with them endlessly. But occasionally, a little bit of adult interaction is advisable for kids. The reason is simple, young children learn a lot of mannerisms, poise and behavioral elements from adults. A good adult company does wonders to kids in many ways.
Benefits of adult company
As children always have a tendency to copy adults, with good adult company, a child is bound to pick up qualities that will be appreciated at large; for example, how to greet, sitting amongst everyone, table manners, talking politely etc. Many times what you as parents can't teach your child, some interesting and dignified adult company does. In many ways, a child in the company of a few trusted adults also matures fast. They behave with much poise and dignity. All these have a positive effect on the overall personality of the child.
So, even though your child may like to run away, ensure that they spend a few hours a week among the company of some trusted adults. This may not be easy initially, but making them join your conversations and speaking about their interests can definitely make this easier. So create a group of adults in his life so that he learns better and faster.