I feel like the love is dying in my marriage

We have a 19 month old together and I’m pregnant with our second. We only just got married in April 2019. Lately, I wonder if I chose the wrong life partner. We are so different from each other and he was so sweet in the very beginning (I got pregnant fairly quick into our relationship) but our parents were friends for years. He’s just soooo negative, and it is draining. He’s almost never in a good mood. He always blames it on stress but it’s just hard to be around him. Also, when he gets upset the way he talks to people just straight up disgusts me. We rarely have sex anymore and I don’t know if it’s just because I’m pregnant and tired or if his attitude just affects my sex drive that much. I feel as if I’m never pampered and he makes me feel like my opinions are less than. It feels like no matter what I do, I don’t do enough and it’s just not “good enough” to his standards because he thinks he is “the best” at everything. I don’t want to break up our marriage, I come from divorced parents myself. I also would hate to complicate things for our children. I’m just truly sad and I don’t have anyone I feel comfortable talking to about this. Please give your opinions or advice, or if you have been in a similar situation.