audio mic y splitter

I have lenovo g70-70 laptop. My laptop have one jack for mic/speakers, but my headset have two plug (one for mic, one for speakers). I m bought splitter something similar...

I have headphones with a microphone that has 1 output 3.5mm jack. My PC has a separate mic and headphone jack. So I bought a splitter cable off of amazon for like $5 that I plug my headphones into and it splits it. I plug it in and I can hear fine out of it but when I try to speak in discord...