MIL 😀😀

So it's my partners first day at his new job tomorrow, me being his fiance went food shopping for him, I was so excited. I got his clothes, lunch esky, shoes etc.. Tonight we went over his mums house, and she packed him his lunch. Agh I just feel so angry and sad. I looked forward to doing that. I feel like I'm not capable of being his Fiancè. Am I okay to be feeling like this?