I bought loads of nappies whilst still preg and didn't start using them until she was 6 weeks old. I needed the time until then to get used to being a mummy and surviving the sleep deprivation.
Don't beat yourself up over using disposables - much as I would like to use cloth from birth on another baby, I suspect we would use sposies for a while. I would suggest you give yourself a few more weeks and then try again. Or, as Annette says, use a couple a day to find out what you do and don't like and to get used to them and then build it up from there.
No-one will think any the less of you because you aren't using cloth nappies. Motherhood is tough going, especially at the beginning, so relax and enjoy it. And if that means no cloth, so be it!