I get that you're nervous and that you like not to be 'showing off'

If you're considering FF just because you think you would be uncomfortable out feeding, I really think you should think again though. I mean, it is still very early days

you and baby are still getting into the swing of things. When she's bigger she will feed less often, you will be more adept at manoeuvring her around, and actually your breasts will probably be a bit more like their normal size. You are in peak crazy milk production at the moment
Do you have a group of friends with similar ages babies? There is nothing that will boost your confidence to feed quite like having buddies who are doing the same thing.

If you don't have a group, then a baby class might be a good idea, or if in the UK, the NCT? Finding friendly cafés, and a good table in that café are also good strategies. Yk, there might be a place where lots of young mothers go, where bfing is pretty normal, where you can find a corner table, or sit with your back to the rest of the room. There are lots of ways round these things.
I don't know where you are but the law in the UK is that a breast-feeding mother has the right to feed anywhere. A lot of public places also have 'breast-feeding' welcome stickers just to encourage you further.
Agree with Fleur about being cautious about introducing formula too early.

But I know you're planning for the future rather than for right now. Just give yourself time to get used to everything.
Posted with Ali, totally agree.