Yes, you do. While there are many viruses that cause the common cold, only 4 are coronaviruses, (HCoV)-NL63, -OC43, -229E, and -HKU1. Unfortunately, none of them provide immunity and you can be reinfected.
There are only 3 other coronaviruses known to infect humans, MERS-COV, SARS-COV1 and now SARS-COV2. MERS provides immunity for a limited time for most (at least 10 months) and at least 18 months for those who had severe cases. SARS1 seems to produce an immune response much longer. Hopefully SARS2 does result in a long term immune response, but we don't know yet.
There are only 3 other coronaviruses known to infect humans, ...
That sounds like a contradiction.
Some viruses like the chickenpox and measles only come around once.