People being against breastfeeding

With my first, I always was prepared for a comment and a retort to give back if anybody looked at me or made a comment. I fed him for 27 months (not really out and about when he was bigger, but if he wanted it I would feed him) and in all that time there was only 1 uncomfortable time!
Building your confidence in places that you can be more comfortable is my biggest advice. I went to a breastfeeding group with my first and that really helped to be with other breastfeeding mums, see if you have anything local. Or M&S cafe I’ve always found good as the staff are so kind and supportive. Plus old women love to have a chat and always tell me well done 😂
If you’re more comfortable covering, maybe look at specific breastfeeding covers rather than a blanket as they might be better if your son gets fussy as I think they’re more lightweight

I totally get this, please know that your feelings are valid! However, breastfeeding is natural and you're doing an incredible thing.

This is my second baby and I breastfed both in public, with my first I expected some horrible comments but I never got any, only nice ones about the baby / how great it is that I'm feeding in public. I agree with what Emily says above, take it slow and steady to begin with, maybe just at baby groups where there'll be other mums feeding and build up from there. If you're worried about feeding somewhere specific, take someone with you who you feel comfortable with like your mum, partner, friend etc as they'll distract you.

I also find that I feel more comfortable in certain clothes (ones with little breastfeeding holes for example, Jo Jo Maman Baby do some lovely dresses for this that you can pick up cheaply on Vinted) as I'm not exposing my whole boob to the world! So maybe do a bit of trial and error with clothing too.

You've got this 👏🏻