pap smear abnormal?

Hi im 27 years old and I need some advise im quiet scared worried I was due for my pap smear test was called back in as it was abnormal and it said possible high grade squamous lesion and I have to go have colposcopy and biopsy recommend my last 2 pap smears were fine and they used a new thin prep pap I think its called I was reading if theres any irritation ect it can give a positive reading for cells abnormal my dr told me no thats not true but some how I think hes wrong has anyone been in the same situation and what treatment do they do do u think this could be a wrong reading pleaas help me ease my mind