Yes those feelings are normal for all new mums to a greater or lesser degree, reguardless of age.
If you have had a complicated delivery this means you have even more healing to do both physical and emotionally.
A lot of new mums feel very protective about their newborn being around others which yes can make you feel edgy. But then you'd be gutted if no one was interested - well I sed to think this 
Conflict - yep this is a period of change as you get to your your baby and a new way of living. Its normal to miss stuff you could do before. Keep you baby close, cuddle lots to help with bonding which can take time. Its different for everyone.
Tell your partner you need their help. It maybe they feel out of their depth and havnt a clue, show them how to bath, feed and wind (if bottle fed).
Yes it absolutley baby blues - keep an eye on how you feel but please give yourself time to recover from the birth - not everyone is up and about and 'popping back into shape' (rare if you ask me!)
Tell you HV how you feel if you dont fee like you levelling out. It can be hard to sort out how you feel when tired too, even after recovery from the birth.
When you feel up to it (and only then) try to go out short distances. Gradually build up. Plenty time for baby groups later which help a lot to see others and get into a new routine.
I hope this helps. Keep reading on here, there are lots of threads about birth, recovery, early baby days in other sections. When you are up late stuck with baby and tired try to read these - I always felt less alone then
Take care x