Annoying rant

Ok So this is my first pregnancy and I have this cousin who's like 19 and never been pregnant. She's from this country in Central America, and where she's from, they don't give you things like food or actives to be careful about while you're pregnant. So today we were at a birthday party and I asked for a Coca Cola because I just wanted to take some sips. My mom said don't drink too much caffeine because you haven't been drinking water lately. She's right because I've been drinking fruit punch and soda and never any water. Well my cousin she made this face and was like it's just soda drink as much as you want. She does this with everything. I was telling my boyfriend over the phone how my back was super sore and I had some cramps and she was like oh my gosh. And I said what? And she said there's something always wrong with you. I'm pregnant my body is changing what the hell do you expect? She wanted me to hike and climb up a mountain with her and our families. I didn't want to. Our other cousin is 7 months pregnant and she didn't want to climb it either so my cousin who did want to go was like wow you're not going to die climbing it. To get to the top I'd have to climb up unstable rocks and then go back down the same way. Every time I climbed the mountain before I would fall going back down so I didn't want to take any chances. There's day I am super nauseous and tired and she ask me to go running. I always tell her that I don't feel good and she gets pissed and says it wouldn't kill you to get fresh air. She's so up my butt about these things and it's so annoying. I just want to enjoy my pregnancy without being annoyed all the time to do things I don't want to do. Who is she to tell me what I can and can't do while I'm pregnant when she's never been pregnant herself? This is my first pregnancy and I'm just trying to take care of myself as best as I can.