Take it from me, there’s nothing more depressing than sitting alone at home all day, watching cable news while being bored out of your mind. If you think about it, when we retire, we lose a lot.

All at once, we lose our sense of purpose, our identity, our community, our structure and our routines. It’s important to find ways to replace these elements, or we could end up losing our minds—or worse.

I spent a long time pondering why I ended up suffering, while people like my mother are able to retire happily with no negative side effects. She was comfortable in retirement and didn’t miss her earlier, busier years.

Read: We’re in our 60s and have lost $250,000 in our 401(k) plans — can we still retire?

After a lot of research and self-reflection, I came to realize that I was quite different from my mother. My retirement shock was related to my inability to satisfy some fundamental needs that I was born with, needs that must be fulfilled for me to lead a happy, healthy life.

Unlike my mother, I’m a growth-oriented retiree. I have a strong need for autonomy, variety and identity. Being labeled as “retired” isn’t going to do it for me. In fact, it irritates me.

Read: We retired early and split our lives between Mexico, California and a van — and never looked back

I have a strong need to do things that are interesting and challenging, those activities that give me satisfaction and a sense of achievement. For instance, I’ve always had a strong need to help others. When I get an opportunity to do that, it makes me feel really good inside.

These needs never go away—not even in retirement. While I no longer want to be a banker, I realize that there were certain aspects of my work that I enjoyed and which gave me a sense of accomplishment. I lost that when I was forced to retire. Until I could discover alternative ways to satisfy these needs, I was stuck in retirement hell, and suffered from depression and anxiety.

Read: ‘I’m retiring, so what do I do with my 401(k)?’ You have four choices — but only three of them are good.

Some retirees don’t hunger for work and embrace what happens. Others—the growth-oriented ones—try to numb their feelings by, say, eating or drinking too much. This behavior might bring temporary relief, but also longer-term problems. If you’re not careful, retirement shock will age you and extinguish the fire inside. You don’t want to end up like some retirees, sleepwalking through the best years of your life.

Read: I went searching for the perfect place to live in retirement — and got lost along the way

I can’t tell you how many stories I’ve heard from people about a family member or friend who wound up miserable after retiring. Many of them had enjoyed successful careers as doctors, teachers and senior executives.

They should’ve had a great retirement but didn’t—because they no longer had the strong sense of purpose they’d had when they were working. They no longer made a daily contribution that gave their life meaning and coherence. If you have a choice, why would you retire from doing something you love to do? That doesn’t make a lot of sense to me.

Unfortunately, few financial advis​ers talk about this vital aspect of retirement planning. This can result in some clients leading purposeless, unproductive lives.

I will leave you with a suggestion to help you avoid this fate. Retirement is one of the biggest life transitions you’ll ever experience. It’s an individual process, and what works for your retired friends might not work for you.

Know your strongest needs—the things that really turn you on—and then find activities that will satisfy them on a regular basis. That’s the key to a happy, fulfilling retirement. It’s as simple as that. Too bad it took me so long to figure it out.

This column first appeared on Humble Dollar. It was republished with permission.

Mike Drak is a 38-year veteran of the financial services industry. He’s the co-author of Longevity Lifestyle by Design, Retirement Heaven or Hell and Victory Lap Retirement. Mike works with his wife, an investment adviser, to help clients design a fulfilling retirement. For more on Mike, head to BoomingEncore.com.