Should i be feeling this guilty

I Get 300 a month in child support for mY daughter who is 3...i feel guilty bc im using that money for gas and insurance which together is about 130 then i have to pay my parents back for a tv so im doing 25 a month for that im still looking for a job but being that i am 30 weeks pregnant no one is hiring me i started showing really early and i know its wrong of them to do but i know its the only reason they have not to hire me especially as simple as something as a waitress but i am still looking everyday and im struggling my childrens dad cheated on me and left me for the girl he cheated on me with when i was about 12 weeks pregnant ...i feel so bad i feel guilty i feel like its my fault i feel like a failure and most of all i kinda feel like im stealing my daughters money yes i buy her things she needs with it like pull ups and anything else like hygiene wise or anything else she needs and all that it just bugs me that i have to do it that way and i don't think its right that im using her money i just need advise am i doing the wrong thing here

I was with him for four years and we were engaged and actually planned this 2nd baby b4 i found out about his cheating i was a stay at home mom also.