Please help

Why do I feel this way? I'm never in the mood for sex, even kissing is frustrating, I don't feel sexy at all at only 16 weeks, I'm used to having a nice body and nowerdays I keep hearing how much I've changed and gained weight, I'm sad because I don't feel proud of my bump I'm just trying to hide it, I'm mostly just tired angry and uncomfortable... I need this to get better but how?! Please help