Should I start a private pension?

I’m 20 y/o and make around £2000-£2500/month. I invest in VUSA at £250 a month, live at home with parents (£80 a week), have car payments (£270 a month for 4 more years) & have my emergency fund built up. I’ve always got spare money running through my current account, and was looking to see if it’s worth using it to start building a private pension? Older colleagues at work have told me to look into it as they wish they had done it sooner. TYIA.