To think that not having friends should be encouraged

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As I find that nearly everyone in my family has had trouble with their friends shouldn't us humans focus more on indiuvdal lives rather than friendship. I really don't see what people get out of friendship.

I think it's better to have no friends, than the wrong friends. By 'wrong' I mean, wrong for you rather than (necessarily) 'toxic' friends. If you have friends who are kind people but you feel all the time that you have to put on an act with them (pretend you like doing the same things, value the same things, hold similar opinions etc.) it is mentally draining.

Thing is OP, these issues we face in our relationships (friendships, etc.) are supposed to be a learning curve. They teach us how to cope in different situations, what worked and what didn't. These experiments can help us build better friendships, develop our boundaries and develop resilience.
Rather than see all past friendships as negative, try and pinpoint what was positive. Nothing is all bad or all good, that's life. However, I wouldn't encourage people not to have friends, as social isolation is really not healthy ( physically and mentally). I understand if you feel burnt in the past, but that was then. The future does not have to be the same.

Experiments? Experiences, ffs

I think the opposite, OP.

However, I don't think people who don't seek the friendship of others should be made to feel that there is something 'wrong' with them.

Some people are self sufficient and don't 'need' friendships, but these people often find support through other means, such as family or colleagues.

However, humans as a species are social animals and we thrive when we have the support of other humans. My friends are like family to me, they help get me through the trials and tribulations of life and are there for me when I'm happy, too. Loneliness is insidious in that it doesn't physically harm us, but it's extremely damaging and unhealthy to live a lonely life void of love and support. So I do think friendship should be encouraged.

There's also a difference between being alone and being lonely. I have RL friends for the first time in about 20 years now but I don't get lonely. I struggle with people around me all the time and I think I would struggle if I didn't live on my own.

You are at college aren't you OP? Any possibility of friends there?

I remember you said you struggled with interactions so perhaps having a lot of friends isn't the best thing for you - it isn't for everyone.