Guilty about filing for child support

Hey y'all, my daughters father (my ex) has paid 100 dollars to date and my daughter is now 7 months old. He paid me the 100 after I begged for a few months while I was pregnant telling him how expensive my prenatal appts were. He said he paid me bc felt bad for me. 
My lawyer has suggested it because he hasn't followed through from our mediation agreement (his lawyer felt the number was still too high even tho it's only 20% of my daughters medical expenses) I pay the other 80% but right now I'm paying 100% cuz he ain't providing shit. 
Why am I feeling so guilty about filing for child support? Why do I feel like I'm getting him in Trouble or like I'm the bad guy?