I'm going to offer up what might be a bit different advice. Comparing yourself to others isn't necessarily a bad thing. Doing this can tell you who can help you improve, or maybe you identify role models, appreciate a good mentor, etc... Or it can show you who you might be able to help. Sometimes we all need some help.
The real battle is in how you define your sense of worth. Take smarts, for example. In your life, you are going to encounter people smarter than you are, as well as not as smart, or maybe you can't really tell. What does that really mean?
Think about being smart enough. One artifact of that thought could be what you accomplish boils down to how willing you are to do the work to actually accomplish it. Being willing is very high value! Suddenly, how smart you are isn't a defining attribute. Your intent and resolve are.
Another artifact of that might be the realization that smart people "rub off" If you want to improve, being around people better than you is an excellent way to do that, and feeling inadequate gets in the way of all that too. Think back on that intent and resolve and maybe you realize everyone who wants to do stuff with their life has those things and is sharing them with others who appreciate it. Going further, many people respond favorably to someone they see doing the work to get after those big things, whatever they are. And there should be no shame in any of that at all.
Extend that a bit more, and suddenly those comparisons have value! Hard working people rub off. Social people rub off. Etc...
What you need to do is absorb unabashedly. As you encounter others who are compelling in some way, watch and learn! Make a few friends. Those people know it's OK to be who they are, as should you. Those people are doing the work, making the friends, showing good intent. As should you.
Do the work and trust in yourself. Get help when you need it. Give help when others need it. Treat yourself with the same respect you would others you admire or believe you can learn from.
In fact, cultivate a sense of respect. Mutual respect. When you demonstrate this, people most often return it. And if it's your intent to do that, work hard, get something you believe in done, people will most often return that too, and in that process you become one of those people you are comparing yourself to.
Give with honest, good intent, and 'ye shall receive.
You aren't stuck behind anybody. You are where you are, and it's up to you to move forward and do what you want with your life. What you are doing here is looking at younger peers who made different choices and you are wishing you had made those same choices. Or you are buying the bullshit they are selling.
A great many people never, ever really figure out what they want to do with their life. Often, they are too busy living it, having fun, building, doing, playing to think about it. Others are driven, focused, intent.
So you've arrived at some life goal! Good for you. Now quit your regrets and start getting after it, whatever it is. There will always be others who seem better positioned, or whatever. It's not about any of that. There are people who are worse off, or more poorly positioned too.
Do you want to be here? Do you care about other people, the world, and the things you find in it? Great! That's all anyone requires as justification to be here. No joke. Be sure and share that often. People like other people who care. People value others who care too.
Share that thing you want to do with others, and ask them what it is they are wanting to do as well. Maybe you can help, or maybe it's good to just listen and appreciate they are doing something they care about. Maybe you have a common goal.
Maybe you can realize that's all any of us are doing, you included.
Like I said, give and 'ye shall receive.
One great way to feel better about yourself is to help others, and the doing of that does wonders for your own sense of worth. Do it. Clear that mess out of your head and free yourself to get after it, whatever it is. And all those people you helped are very highly likely to appreciate it and return the favor too.