im sorry to hear that, sounds nigh on exactly like me - i have no friends either, no relationship or anyone to talk to.

i tried to end my life too, i took an overdose of insulin and went to sleep hoping i would just die quietly, but it never works out like we plan!
had a hypoglycaemic seizure instead, ended up in a coma and dislocated my shoulder + tore my tricep tendon due to the seizure.

what helped me was finding my passion and purpose, EVERYONE has a purpose and the most important thing you'll do is finding yours.
i got into bodybuilding and after seeing my body change i realised i had more control over my life than i thought.

finding employment helps massively too, start off small like part-time and work up from there - it's what i did and eventually ended up in full time employment which at least gives us a reason to get up in the morning.

but your passion will be the biggest reason.
i still haven't been able to make friends or meet anyone but my passion to keep growing my physique keeps me going.

please give it a chance, think about something that has always interested you and made you feel alive inside.
like a childhood dream, when you find it dedicate your time to it and put your mind into it.
when yourself grow in that interest it really is a great feeling.

also if you can please try to take solace that you're not alone in this, myself and others have been through similar and if it were possible i would definitely be you friend in real life as would others here i'm sure.