A bit of a different suggestion/something to add alongside the great ideas so far.
Try looking on Pinterest for some self care ideas/autumn bucket list type things. You could print one out or copy one/get some ideas and make a pretty list of things you’d like to do over autumn - I’ve found one and attached a picture with the kinds of things I mean. Little tiny things, like going to a coffee shop and ordering a nice autumn drink, making soup, going for a look round the charity shops hunting for a new autumn jumper. I find ideas like this a lot less intimidating then going and joining a group or taking a “big step” though they can be good too.
But little things like this can help you to practice some self care, and give you ideas. So if your mum is busy at the weekend and you’re sat at home you may look and decide to go out get some things to make an autumn craft (again Pinterest etc good for ideas here). You could go an buy the bits, come home, light a candle and make it. Just romanticising your life a bit, and making small things an event. I find a list really helps me because I struggle to think of ideas of things to do. This is also helpful if you don’t really know what you like/enjoy in life. Maybe have a look, find a list like this you like and challenge yourself to do as many of them as you can.
You may realise you hate baking, but you really enjoy lighting a candle and reading a book with a candle. It’s okay not to have big social hobbies, or a huge group of friends. I think start with working out who you are, and what you like and enjoy.
it could also be good to make a list separately of things that bring you joy/make you feel good. These can be tiny little things again - drinking coffee in bed first thing in the morning at the weekend, a hot bath with a bath bomb and candles, doing a jigsaw puzzle, cooking dinner for you and your parents. Write down anything you can think of and try to do one thing a day that brings you joy. At the weekends pick something from your autumn bucket list/self care list and go for it. I used to not see the point of wondering around the shops by myself, but I don’t feel funny about it if I’m out with a purpose - buying a new jumper/picking an autumn candle/getting supplies for a craft or cooking/baking. You can make these little things an “event” and elevate the everyday in tiny ways - maybe you buy a nice autumn mug and drink your coffee out of that everyday, maybe you buy a candle you like in TK maxx and burn it in the evening when you’re watching TV with your parents. Maybe you make a craft and it turns out a bit rubbish but you hang it up in the house/in your room and just be proud of your little effort.
I was very very lonely and sad about 6 years ago. I had awful self esteem and felt like there was nothing good in my life, and I was all alone. My life has changed beyond recognition. I have a partner, two beautiful children, a home of my own. I have one very good friend. I don’t have a huge gaggle of friends, and don’t do a super social hobby because it’s not very me. But I’ve realised I really really enjoy these little things. I’m a homebody, but by choice. I go out and do things, but it’s all these tiny little rituals that make me happy and string together to make a life. I spent a lot of time waiting for the big milestones, or waiting for things to happen to me to make things better. I realised nothing would change unless I did, and so I started doing tiny things to make me feel happy. I realised who I was and what I enjoy, and am so at peace with myself now.
Things can get better and there are so many people out there. The world is a big place and there is someone for everyone - both for friendships and partnerships. It helped me to realise I didn’t have to meet 100 friends - I had to find one person I clicked with, and I had a friend. You don’t have to meet 100 perfect partners - just one person who clicks. You may be different, but there are different people out there too who may be looking for someone like you.