Feeling bad about feeling bad..

I am nearly 19 weeks and still feeling completely exhausted and generally awful everyday. I see so many due in Feb saying the tiredness has gone and they feel great. I'm so incredibly excited and blessed to be having this little bundle and yet I can't wait to stop feeling this way! I eat well, I take supplements and had my iron levels checked a few weeks ago and they were fine. I guess I'm just wondering if there's anyone else feeling the same? Any advice?!