People are stupid.
I had so much negativity when I was going to bf at 18, from 'it's too hard', 'you'll ruin your boobs' to 'you won't be able to out/get drunk' etc, etc.
Any bf problems were dealt with from family and friends to health professionals with 'give her a bottle'.
I managed 4 weeks exclusively until her first growth spurt, where as all my family etc had formula fed I had no idea what was happening when she seemed so hungry wanting to feed so much. I bought a can of formula, and then my health visitor gave me the
'all my young girls think they can do it all until about 4 weeks and then the proverbial hits the fan etc'.
She advised me to mix feed and that was the beginning of the end for us, mix feeding until my milk supply dwindled and she was completely FF by 6 months.
2nd time around I was 20 when I fell pregnant. Thank god for the internet lol, although things had improved in the advice by health care professionals due to a breastfeeding push in the healthcare system, family and friends attitudes hadn't changed much. Still, this time i made sure I did the research myself, I knew what to expect and was able to make my own decisions and rebutt the rubbish that people trotted out as fact.
My youngest was exclusively breastfed for 6m until weaned, then along with food until she was nearly 2, despite the very first thing my mil saying when she was born being
' she's a big baby, some babies are just too big and hungry to breastfeed you know'.
I'd definitely advise anyone planning to breastfeed to do your reading, get involved in a peer support group (even an online one) and find a breastfeeding friendly healthcare provider and have faith in yourself.
You can do it.