You are in uni, I see in other posts.

As a mature student myself, I am probably doing a terrible job, but this is really one of the best settings any person can ever be in to make friends. I feel.

There are many people your age, exploring adult life for the first time. Many smart, ambitious, motivated people. People with insecurities and people open to new people, experiences, ideas, willing come out of their comfort zone, or open to other people helping to drag them out of their comfort zone. People looking for new people to practice their old sports and hobbies with.

You should try to figure out in what respects you aren't exploiting this. I know, I barely practice what I preach. But I feel this is true nonetheless and you can probably make improvements there.

It will be so different when in age 35-45, where people have families, jobs, are stuck in their old lives, aren't open to new ideas, etc etc.

You only live in the present. Make sure you have no regrets of not making the most out of your student life when your student life is over.
You say you live with your parents in an older post. I suggest moving to the university town.
Better to be lonely in university town, than to sit at your parents place behind a computer, as even I do.
Many people are lonely there, and it's ok. You can actually tell people this, and they will be nice to you and be inclusive.