first, getting rid of the whole solipsistic background would be a good start.
We are data processing units, we are social animals living within a social network. Our society and its members provide us with knowledge, information and the processing power of other human beings.
Therefore as a thinker, you have to see a rich social life as a way to intellectually enrich your life.
I haven't slept so I'm really not in shape to write a mid term paper on social dynamics in the post modern early 21st century or something.
Lets make it simple.
You like ideas, thinking things over, see how it all works. (So do I)
Well, try studying inter group social dynamics, bodylanguage, biological anthropology, neuro linguistic programmation, sociology and so on.
Make people a subject of study, turn socialization into a game of skills, learning to go with the flow while keeping it intellectual, use your mind as an advantage.
Why?
Because More interaction equals to more possibilities equals to more stimulations.
More informations, new topics of interest, building your social muscle using what you have instead of seeing it as a forceful process, a 10meters high wall.
Learn to do most of the thinking in real time, make it a challenge to yourself instead of an aimless quest for normality.
You don't have to find some awesome organisation, some very special activity. This is a bias we all have, thinking that simple things everybody do cannot be just as complex and fascinating as any so called intellectual field.