why can't my baby sleep through the night?

Irene • I am a single mother of 1 son. He is 8 months old. I live with my folks and my goal is to live on my own.
What am I doing wrong with my sleep schedule... I mean he is 7 months old and he sill walks up at 11pm 3pm and again at 6pm. I literally got upset knowing I the lack of sleep has impacted me. I feel irritated. I can't just let him cry because my parents get upset when I do I have to keep feeding him. It's like the only way. Does body have this issue and if so have you found a solution that maybe able to help me out?