None of us love Jesus enough, not even the great saints. Many saints and prayers have expressed that as puny humans, we can never love Jesus enough.
Your priest will likely give you some guidance on this. However, usually when we want to confess “not loving Jesus enough” it’s necessary to be more specific about exactly what we did or didn’t do that was “unloving”. Like, did we miss Sunday Mass for no good reason, or did we neglect praying for 2 days on vacation, or were we angry at God about something, or were we unkind to our neighbor and thus by extension unkind to Jesus. As CathF said, we can never love Jesus enough for what he did for us, so all day every day we’re all guilty of “not loving Jesus enough”, but the ways we fail in that love show us what faults each of us specifically needs to work on.