Latching Issues

I'm exclusively breastfeeding and having issues with my LO's latch... she's 6 weeks and still constantly on/off/on/off and so on... it's making me raw and I don't know how to correct it. I also have to pretty much do all the work to get her latched on or she just cries and doesn't naturally do it herself. Is it to early for that? I don't think I'm having issues with production or flow and she's definitely hungry... I do have larger breasts though. Could that be why she's unlatching so much? Does anyone have any advice?