Feeding guilt

I had my baby on Sunday and prior to birth was really pleased that I could harvest colostrum and was keeping options open for feeding.

I'm currently combination feeding between foruma and expressing/pumping but I feel that pumping is restricting me a lot and putting a lot of pressure on me. It's so frequent, my boobs are huge and painful, and I think I'll want to stay in rather than going out because I won't want to express in public. Baby seems less satified with breast milk (which is still colostrum) and wants more frequent feeds, whereas formula keeps him fuller for longer. I also don't want to breast feed. In short, I'm too impatient for latching, plus it is painful.

I am considering stopping before my milk properly comes in but I wondered if there is a certain time period that is really important for baby to get breast milk? I could probably manage a bit longer whilst my husband is off work with me. I just feel guilty for giving up so soon!