FTM Breastfeeding 😕😖

I'm 6 days pp and I been breastfeeding since she's been born, and it was great in the hospital, but since being home it's been difficult. She has a slight tongue tie and my nipples don't point out enough to get her to latch very long. I use a nipple guard but it still feels like she isn't drinking enough from both boobs. I end up bottle feeding her between an ounce and ounce & a half, when she keeps resisting to latch. But when I pumped I get about 3oz from each boob. I really want to breastfeed until she's about 1, but I'm worried she's starving and isn't making enough wet and pooped diapers. 😖