Been alone for 3 now coming up on 4 years

Hi all new here. I'm 19 M from London. And been completely alone for 3 now coming up on 4 years now when I mean completely alone I literally mean completely alone. I do not go uni didn't go college or sixth form or anything like that. Reason being is as I left school system after high school for a business venture. Only person I've spoken to in past few years is my mom not even joking. I did for 7 months though speak to a girl on a friend vibe due to us being in business together over something however that has recently ended and tbh found she only really conversated because of business.

But idk it does get to me sometimes like everyone around my age is in UNI or working a job socialising making friends and I'm here at night sitting alone in my room. My best friends are my dogs literally.

Ontop of that I'm just worried also people only speak to me for personal gain cause of business built up which seems be case with that individual whom I thought was a genuine friend but seems not even then we didn't talk much again haven't spoken to anyone since high school.

I'm thinking about what to do I'm also not very social able at all very introverted idk just feel like gonna be alone for a long while :(