Soooo bare with me lol

I'm 21 and my boyfriend is 22 we've been together and living together for 3 years. When me and my boyfriend met I was just ending a relationship with my ex, we would meet up constantly just to have sex. I wasnt even sure if I wanted to be in a relationship at first, I just knew we had great chemistry. Very tmi, but we would have sex several times a day every single time we saw each other (which was almost everyday). And even when I ended up moving in and we became official, we would still have sex all the time. Flash forward to now, we never have sex anymore. I'm lucky if I get it once every 2 months. We've been having this problem for about a little over a year. It was so bad to the point where we didn't have sex for 9 months. Not even once. I try so hard to initiate it, anything and everything I can to try and be attractive but I always get turned down. Told its "not a good time", "bad timing", "not in the mood", "I just ate", "my stomach hurts". It's just consistantly every day excuses. My confidence is so shot, I just feel so ugly and disgusting. I've never felt so unwanted in my entire life. Before me and him met I always had guys wanting to take me out or trying to get into my pants (not being cocky just trying to make a point) and now not even the love of my life wants me. I feel terrible and extremely depressed all the time. And the very few times we do have sex, it's so one sided. It's honestly so disappointing. Constantly making someone else feel good and never getting anything in return. Honestly, I have no idea what to do? We have a 3month old baby together and I love him so much, but it's getting to the point where I feel like a roomate.... I just need advice any advice.