Yes, it is compulsory for you to get circumcised as the Hadeeth narrated from Imam Jafar Al-Sadiq (AS) that Imam Ali (AS) said: When a man becomes a Muslim, he must get circumcised even if he reached the age of eighty.
( Was'il al-Shia by al-Hurr al-Aamili, vol. 21, page 440.)
It is not allowed for man to perform Tawaf ( around the Ka'bah) if he is not circumcised as it narrated from Imam Jafar Al-Sadiq ( AS): uncircumcised man is not allowed to do Tawaf around Ka'bah. ( Wasa'il al-Shia by al-Hurr al-Aamili, vol. 13, page 270).