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The verb Catullus uses is odisse, not odire (from which you would get an imperative odi).
This verb only has forms in the perfect system but the meaning is that of the present system.
That is, what is the present active indicative by meaning is odi, odisti, odit, odimus, odistis, oderunt — perfect active indicative forms.
This is one of the defective verbs ...
13
Joonas's answer is entirely correct, but to give a slightly different explanation:
Some verbs in Latin are defective. Some of their forms are outright missing, for no obvious reason. For example, the verb ait "say" is always cited in the third person singular present—because most of the other forms we'd cite don't exist! It has no first person ...
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