of cos. it's natural to feel this way. it's mostly due to the extra weight you've gained which, asides from baby, also includes placenta & water retained.
important thing is not to dwell on it. you'll only look like that for 9 months. after delivery you'll have all the time & freedom to retrieve your "old self".
of cos things can't be 100% the same but hey, slim & beautiful moms DO exist. if you're disciplined enough you can be one of them.
but for now focus on the wellbeing of your baby - that should come first.