I can see why you're worried, I have the same fears as my little man will be going to daycare two days a week starting September.
One thing that's really important to remember is what Jaspen said - they will often be very different with a carer than they are with you. With the boob for example - if they KNOW you aren't there so booby isn't an option they're more likely to drink from a cup for the carer...etc etc. Obviously every kid is different in this respect but she may just surprise you.
The other thing I'd suggest is to look into family daycare as an alternative to a larger centre. With young babies and infants FDC carers often have more time to spend settling them etc and because it's one consistent carer every single day they often settle in with much less fuss. I really found this when my DD started at 7 months.
Good luck with it all it's hard!