Will aint got any friends? so unrealistic.

In 2002?

And he did have friends. Christine for example, someone obviously invited him to that private dinner party at which he met Rachel also.

Will does have friends, but I think the film makes clear that the reason he is alone all the time is because he is too self-centered to be bothered with even the effort of forming emotional attachments. There was a great voice-over (monologue) at the beginning, where he compares his life to a television series and basically says it is a one-man show, not an ensemble cast. The point of the film was that it took contact with a young boy to actually awaken in him the desire to reach out to people and to grow up toward emotional maturity.

I personally think he and Marcus developed a friendship because they both had bad social skills and trouble interacting with others. Each had different reasons and backgrounds, but they had that similar kinship. Will was too self-absorbed and painfully blunt to keep many friends. Remember what he said to the couple in the beginning when they asked him to be their baby's godfather?

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It's not that unrealistic.

Think about it. People tend to make friends in school or at work.

He's rich and doesn't work. He likely didn't go to college because he had no use for it, so he didn't make any friendships there. He doesn't work, so he hasn't made any friendships there either. Even if he had made friends in high school, they're all likely married with families by now, so they're not stopping by to hang out, if they've kept in touch at all.

He's self-centered. He fills up his day by getting haircuts, or playing pool, surfing the internet, buying things, which are all activities that to others are not activities at all, but to him are things he can do to fill up a day on his own. He's able to keep himself happily entertained on his own. He's really not put into any social setting where he'd make friends, and he feels fine on his own and doesn't need them. He probably has friends he's met along the way, but they have their own lives so they're not constantly in his life, and his character enjoys being alone so he's not likely to call them up to hang out.

In the beginning of the book he mentions having guy friends. But they all started getting married and having kids and his life and their life became so different that they drifted apart.

Christine and her husband consider Will a good enough friend to ask him to be their daughter's godfather. And like someone else on here said, he was invited to that dinner party where he met Rachel. He has friends, he just doesn't like people very much so he doesn't hang out with them very often. He prefers to be alone.

He did! They showed less of it in the film compared to the book but they made it clear. Let's see, there was the couple he saw at the beginning who wanted him to be a godfather. Then there was the party he was invited to when he met Rachel. Oh, and that friend he had who wanted him to work for Amnesty International who appeared again at the end. They showed he wasn't a complete loner, but obviously without work or other activities his way to meet people was a bit limited. It also showed how by his age most people were having kids and spending more time with their partner and kids rather than other single friends, that was one of the point of the films. Also, he didn't want close emotional attachments! His opening voiceover made that very clear.