Baby fever, jealousy, frustration 😩😭

Okay so this is going to be kind of long so I apologize in advance. I am currently going through a divorce, and I have two beautiful sons with my ex. My oldest is almost three and my youngest is 4 months old. When I found out my youngest was a boy I bawled my eyes out, I love him to death and I wouldn’t change him for the world, but I’ve wanted a daughter desperately since I found out I was pregnant with him. Well my ex got his coworker knocked up (while I was pregnant, hence the divorce), and he’s getting the daughter he’s always wanted (I mean since we had our first). I am so angry and so jealous and I’ve been trying to just keep it in for months but it’s so hard. In what universe does the person who makes all the wrong decisions, and turns into an awful person, get everything they want? Meanwhile I gave up my life for him, didn’t cheat even when he started treating me like shit (there was a lot of mental abuse), and I’m trying to make the right decisions, but I get the shit end of the stick. I’m currently seeing someone, I’ve known him for 2 years but only started dating the end of March. He is absolutely amazing and I hope someday, years from now, we can have our own little family. The issue is I wish it didn’t have to be years from now. I long for the day I’m in a happy, stable relationship and can have one or two more kids (hopefully one daughter but I know that isn’t a given). And it honestly makes me mad and incredibly depressed that because I want to do it the right way, it’s going to be so long. I could really use some encouraging words and advice to get through this. Also I’m only 21 if that makes a difference to people.