C peg constantly hitting either head or neck no matter what angle or endpin length

hey so I've been playing cello for around three months now and really enjoying it. my biggest issue is the fact that my cello C peg is constantly being an annoyance and making me tilt my head forward, creating bad posture and making playing uncomfortable

I have a 4/4 cello btw and I'm quiet tall so that could be impacting it. I really need some suggestions as the posture and pain is really making playing not enjoyable