Well hell, how many surf boards do you have to buy before you're "into it" ?
I rented a surf board once, in Ocean City, NJ, when I was just a kid in the sixties. I got up once in 3 to 4 foot waves, and got cursed out by some guy for cutting him off. End of career.
I have farted around at the beach and had a good time but have never been a proficient surfer. In my view it is a lot of work for not a lot of thrill, and living in the Northwest... ocean water is cold even in the summer. The advantage is the waters are not crowded. I tried surfing once in Hawaii but even though the water was warm... every where we went there were tons of other people.
I have barely spent a thousand dollars on surfing stuff in the last 40 years. My other “hobbies” have cost tens of thousands of dollars and a significant amount of time. There is a major difference in both commitment and investment. That would be my definition of when you are into something.