Unexpected pregnancy. HELP!!!!

So last week I found out that I'm pregnant. I'm 18 so the news was terrifying. I'm on birth control and he always wears protection so it came as a huge shock. Only reason I took the test was because I was late and wanted to go to a party where there would probably be drinking and smoking. I don't drink often at all but before I do I always take a pregnancy test before if I'm late. Usually I'm just late because of the birth control. So you can imagine my surprise when it was positive. My boyfriend is 18 too and when I told him his first response was hat I had to get rid of it 😔. O don't want to. I KNOW I can do this. And I know it'll be hard but I know it's what's right for me. I would never judge anyone for getting an abortion or going through with an adoption but I just can't. I have so much love and support and I know I can be a good mom. I know that no matter what I can do what it takes to make sure this baby has a good life... and it already means so much to me. But my boyfriend won't budge. He's even threatened to kill himself if I keep it. He got his mom involved by telling her I was doing something so wrong and I was cruel and I didn't care about him. She doesn't know that I'm pregnant she just thinks I'm fine with him killing himself. And I'm not. What do I do? If I keep it I'm killing him. If I don't I'm killing me. Because I don't think I'll be able to live with myself after that choice. And I wouldn't be suicidal I don't think. I just mean he would completely lose me and I'd feel dead inside. He insists that killing it is the only way for US to be okay... but it's part of us! And I can't just kill it and be okay it's not okay. Not for me and not for us. And I just don't know what to do... help please... I getting so depressed and stressed 😔😔