you've had tons of good tips on giving up, but just thought i'd mention a few things about your reasons for giving up
would like to conceive again asap- you might find that cutting down helps. I also know a lot of people who have got pregnant before their periods returned, whilst continuing with BF.
he uses his teeth. a lot- this can be stopped, read up on kellymom about bititng and nursing manners
i am just not that brave - am feeling disapproval from some friends, dh has mentioned it a couple of times - i know i shouldn't care, i am weak. - can't help with this one i'm afraid, although i think as they get older it's easier to "hide" it from other people (not your dh obv) and it needn't be obvious that you're still breastfeeding
i would like to wear a normal bra- again, plenty of people do
i hate expressing- why do you need to express? i fed ds2 til he was 16m and never expressed once
i would like to stay out overnight without having to leave a milk store / worry about not leaving a milk store- personal preference, you could leave him cows milk in a bottle now if you wanted, or you mighjt find that he's fine without breastmilk if you aren't there
i would love to get drunk, just once before i get pregnant again without worrying about boob- ditto above!!!