Nervous

I'm only 23 weeks and find myself thinking about my babies birth a lot. This is my second baby, with my first I had an epidural, but this time I want to do a med. free birth. I'm really nervous cause I don't know if I'm gunna be able to handle the pain, it doesn't help that my mom keeps telling me I won't be able to do it and that I'm going to "puss out". Any advice to help with my nerves ladies? Also what can I do if during birth the pain is too bad? Thanks beauties. ❤