DC1 was born at home with no analgesia. I was at home, I had one to one care from a midwife, I could wander around if I wanted. Most importantly, I didn't have contractions every 3 minutes until I was ready to push, so found things relatively easy to cope with, to the point that the midwife when she first came round didn't believe I was in labour until she examined me and found I was 7cm.
I had shingles a year or so later and said that the pain of that was worse than the pain of childbirth.
DC3 was induced at 39 weeks because of complications. While I'd wanted and my MWs supported me having an active labour, they kept losing her heartbeat on the CTG so we agreed I needed a fetal scalp monitor which kept me sitting in bed. I needed Syntocinin which ramped up my contractions and meant I didn't have any the same rest in between contractions as I did with DC1. The epidural was great, enough to deal with the agonising pain that I could do little about but nice and light enough that I could still move my legs. DC3 wasn't ideally positioned either which made things a bit more difficult again.
So, no, it isn't just pain threshold. For me, it was
positioning
moving around or not being able to
syntocinon induced contractions v natural contractions
perhaps being at home v being in hospital
having slept well the night before v having had 3 nights of more broken sleep in a postnatal ward waiting to be induced
position of the baby
I think lots of things can affect how we perceive pain, so I wouldn't beat yourself up about finding it painful!