GOING TO BE 21 WITH 2 KIDS

Basically, I just feel so upset and tearful and worried right now so any advice would be appreciated!

So me and my boyfriend have been together for around 3 nearly 4 years, we’re engaged, I know for sure that he is the one that I can imagine the complete rest of my life with. We actually had an unplanned pregnancy and I got pregnant at 18 and had my little boy when I was 19 (he was only 20). He’s 10 months old now and I’m pregnant again - around 7 weeks. We did try for another baby, I thought that we were ready and I was so sure that it was what I wanted. My mum enlightened me today that she thought it was a stupid decision to have 2 babies so close in age and at a young age and I’m thinking what if she’s right? I’m going to be 21 with two little kids. Firstly, im worried that everyone is going to think I’m beyond stupid for doing this and maybe I am! I’m worried that maybe I should have waited! I’m worried that my little boy who I love more than anything will feel pushed to the side. Also, may be tmi but what if my fiancé doesn’t find me as attractive anymore... my little boy has already given me sooo many stretch marks, and obviously down below just isn’t the same after him. I’m going to be 21 with even more of a stretch mark saggy belly with a huge vagina. 21. It’s going to be so stressful.

I’m so worried that ive made a really stupid decision. I don’t know whether it’s because I’m so hormonal or what that I feel like this. I’m just so confused!