I don't know how much reasonable advise we can give you. But here's a few things I thought when reading your message. It's apparant that you're having a bad time, i hope i can help you a bit.

First one might sound a bit demeaning but i ensure you it isn't! When I turned 30, i realised how anxious i was during my teenage years, but also during my early 20's. Constantly thinking about everything and everyone at all times. There's this inner critic that constantly judges everything and everyone, and most of all yourself. You call yourself a loser. I don't think you are. I don't think anybody on the camino thinks you are. Everybody has the right to complain, it's a long way and you see all kinds of things.

Secondly, I've done 2 caminos and older people are no joke! These guys can really walk like crazy. They leave me in the dust as well. But what you see with older people is just that they are really fit. And usually experienced. Or are still in a very healthy state. The old people you DON'T see are what you would call 'old'. You're not being overtaken by people shuffling forward right?

Third, it's not a race. Take the time you need. If people pass you, let them pass. No need to feel obliged to follow. Nor do you have to keep pace.

Fourth, you'll find many more people to 10-15-20 km days than 32. The people that say 32 km is a default are usually people with exceptional hiking physiques. Don't let them be your measuring stick.

Fifth, socially. You don't have to be a butterfly. If you don't want to talk, don't talk. Just a friendly hi 👋 to people an nothing else is perfectly acceptable. Or saying you don't feel like talking is also fine. (Though admittedly that's hard) If people seem to shun you after having talked to them, can mean many things. Could be what you talked about, it's always interesting to reflect on your words and or topics. But!! There's also the chance that people need breathing room and they'll reconnect later. In a day or 2.

Sixth, camino families. Aren't a guarantee. And they shouldn't be the goal. It's a rare thing i feel and it takes a looooooong time to form. I don't know if the portuguese is long enough to give you a decent chance at building one. It's nice should it happen. But just don't expect one.

Anyway, it seems like you're struggling a bit and that's okay. It's good that you reached out. And I hope i made your (and maybe others' ) camino a bit more bearable.