Big Baby Bump

I am 21 weeks and a ftm. Based on my detailed scan, I am having a fairly big baby. I feel so self conscious about my pregnant belly because at 3months I was already starting to show. Now at 5 months, my belly is huge! People have been commenting about how I look like I'm about to give birth or asking if I'm sure I'm not having twins. These comments make me feel so self conscious. Especially when they compare my belly to other pregnant mothers around me who are further along in their pregnancy.