Actually, it is not that unusual to have one breast bigger than the other, especially if you are strongly right-handed or strongly left-handed, since that can develop the muscles under
differently. Even without that reason, women can have slightly dissimilar-sized breasts. As for the bumps, they could be ingrown hairs. I don't think I'd squeeze them, just keep them clean, and if any of them look like they are getting infected, mention it to your gynecologist.