Why do I get value instead of reference when I call a property of a pointer variable in Go?

Question

// config/config.go

package config

import (
        "github.com/spf13/viper"
)

type Config struct {
        Database DatabaseConfig `mapstructure:"database"`
        Server   ServerConfig   `mapstructure:"server"`
        Redis    RedisConfig    `mapstructure:"redis"`
        Jwt      JwtConfig      `mapstructure:"jwt"`
        Smtp     SmtpConfig     `mapstructure:"smtp"`
}

func New() (config *Config) {
        viper.AddConfigPath(".")
        viper.SetConfigName("config")

        if err := viper.ReadInConfig(); err != nil {
                panic(err)
        }

        if err := viper.Unmarshal(&config); err != nil {
                panic(err)
        }

        return
}

// db/connection.go
package db

import (
        "fmt"

        "my.project/config"
        "gorm.io/driver/mysql"
        "gorm.io/gorm"
)

func New(config config.DatabaseConfig) *gorm.DB {
        dsn := fmt.Sprintf(
                "%s:%s@tcp(%s:%d)/%s?charset=utf8mb4&parseTime=True&loc=Local",
                config.Username, config.Password, config.Host, config.Port, config.Database,
        )

        db, err := gorm.Open(mysql.Open(dsn), &gorm.Config{})

        if err != nil {
                fmt.Println("Failed to connect to database")
                panic(err)
        }

        RunMigrations(db)

        return db
}

// main.go
package main

import (
        "fmt"

        "my.project/config"
)

func main() {
        config := config.New()
        fmt.Println(config.Database)
        db := db.New(config.Database)

        if db == nil {
                panic("Failed to connect to database")
        }
}

In the above snippets, config is a reference (a pointer variable, apparently from the return type of config.New()), but config.Database seems to be a value (not a reference).
I assumed config.Database would be a reference either but it's not (I tried to print out them, config was definitely a reference and config.Database was a value).
Can anyone help me to understand why? Thank you in advance!