Oh Sola hugs for you!
I could have written your post - my Ds is 15 months now, and I was alone from, well, the poas really!
I did what you are doing, and sort of hibernated for my full pregnancy. I think there is a basic need in pregnancy to hunker down and protect yourself. I also know how you feel about the jealousy, it hurt to think about couples so excited about their baby, so I stayed away. Thing was, when I bumped into other pregnant ladies or attended antenatal classes (I did 2 sessions right at the end) there was no mention of their partners - the focus was more on labour, worrying about coping with babies etc, and so they were a support because the issues we were facing were the same, if you see what I mean?
For labour my mum was with me, but I was prepared right up to the last minute for doing it alone. Have you considered a doula? You could maybe look at a trainee one so the costs are kept low? The hospital I was in after the birth was made up of only private rooms, so other couples weren't in my face, but like someone up thread said, I was conscious of them being there and of not having many visitors. I think other people were so wrapped up in their own babies though that they wouldn't have noticed if I'd had a brass band in my room so long as I didn't disturb them :)
As for worrying that you won't be able to give you baby enough - you have the advantage here over couples!! All your baby needs is YOU - they don't need any body else, and you don't need to share your attention between your baby and your partner, so you are ahead of the game here!
I won't lie, there are times when being on your own with your baby is the toughest, most overwhelming experience. Sometimes I crave someone to share the good bits with, to debate over the best tactic to manage behaviour, to just hand my ds to so I can nip to the shops without it being a military operation. BUT, my DS is wonderful: he is confident, he is happy, he has the most infectious charming giggle and he loves me, as I adore and love him. We are a team, and that, honestly, is worth every single hard moment a gazillion times over. You can do this, and do this well - and your baby will be a credit to you, because you already care enough that you are worrying you won't be enough.
Listen to what we are telling you, believe us, it is hard - but god it is worth it. If there is anything I can do to help, pm me or post on here -MN dragged me cheered me through my pregnancy, and there are others who have been in your shoes and can prove to you that it will be ok xx (ahh jeez, I never do kisses! Sorry!)