ADHD can cause severe problems in socialization and fitting in with others over the course of your life time. Most people with ADHD attempt to adapt to these difficulties with varying degree of success/failure.

On the flip side of the coin, ADHD people, when in their right element can be very chatty and spontaneous, so people with ADHD can be very social.

Many factors will come into play, their background and general status, how attractive they are, how much chance they have had to learn to socialize etc.

But ADHD can cause damage in all major life areas.