I don't want to go outside...but I don't know why?

I don't get it. So do you want to go out or do you not? You kinda contradicted yourself a little there. It seems like you need to find a passion in life. When someone has lost the will/motivation like you said you have I'd think depression just coz. But since you say you're not then, try to think about what's pulling you indoors and try to take that outside. If it's the computer or tv,that's totally understandable (but you still gotta push yourself out once in a while) but if you're just sleeping indoors then idk, you need to run about a little. That will only happen if you make yourself. Think you can't will only make you procrastinate or prevent you from doing so.

I get that! We moved from Lincolnshire to Northamptonshire 10 months ago, and suddenly, I don't want to go out. I think it's because it feels uncomfortable to me, to think that 'these surroundings are my home now', and maybe you're still homesick, in that you don't feel comfortable with your surroundings, and you were probably really familiar with where you used to live. did you move from somewhere that really contrasted where you live now? like city to country or hot country to cold, or something? or maybe you lived in your last home all your life and then suddenly felt uprooted?

I get it too, where I'm lacking motivation and the energy just to get some fresh air, and I think this might be the reason, but it also feels a bit like claustrophobia...in an open space. Like I feel very alone, even when surrounded by people. It doesn't feel like my home, so maybe that's it for you? Anyway, I really hope I've helped, and that you start to feel better about going outside! maybe just take it in steps? like spending more time in the garden, then taking short walks, etc, until you feel more comfortable? Good luck, anyway, and don't worry too much about this! :) x