What the hell?

So recently I feel like my friends have been seriously off with me, one in particular. Firstly we were all going to go away together to celebrate our 21sts, but I start nursing school so only have a few weeks off a year and my friends decided they were just gonna go away without me because they didn't want to work with my really strict schedule (neither are in school, just work and plenty of time to arrange holiday in advance).
Then I've been really down recently so I've not been as chatty in our group chat so they took that personally and I explained that. 
Now I told them that I think my boyfriend is going to propose because he spoke to his mum about it (eek!) and when I told them one of them was like "oh right. Well it's really annoying because it feels like everybody else is moving out, getting engaged etc." And it just seemed really off, surely they should be happy  for me? Neither of them have had boyfriends or moved out, so are they just jealous? I'm just fed up of feeling like I'm walking on eggshells around them. I guess I just need opinions on whether I'm in the wrong or what 😔

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