BREASTFEEDING struggles.

Hi ladies! My beautiful baby boy was born 3 days ago and I'm soo in love with him. 😍 so far things are going well, but I'm having a bit of trouble breastfeeding. I know it's only been a few days but honestly it's the most stressful thing ever! My milk hasn't come in yet so he's still just having colostrum. There's a few issues but the main one is my nipples are quite flat, which means I have to hold my nipple out with one hand while baby latches on. I know he's not latching perfectly, he doesn't open his mouth wide enough so most of the time he's only sucking on my nipple itself without much areola. This isn't terribly painful at the moment but I know it will become worse with time. We are going home today and I am having a lot of anxiety about whether I can feed him properly. He doesn't open his mouth wide enough to let enough of my breast in. Every midwife says something different and they all have me doing different things which is really hard, and I'm very confused and unsure. My main question is is he still going to be getting enough milk/colostrum if he's only latching on to my nipple and a tiny bit of areola? Or is he going to not be getting anything out? I feel like he's really hungry 😫 does anybody have any advice? I'm really worried and don't know what to do.