I'm not sure how I missed this post, but now that I've found it I will do my best.
Have you heard of The Four Agreements? I just discovered it on YouTube and found it pretty profound yet concise and accessible. I'm definitely going to give it another listen. I'm not sure if that's relevant to your question, but it popped into my head, so it might be.
Another perspective I've found very valuable is Jordan Peterson's 12 Rules for Life. I haven't read the whole thing, but I've watched so many of his videos and gotten clarity on a lot of relevant issues. He's a clinical psychologist with many years of experience, and he has a bunch of Q&A videos on YouTube.
A perspective that I always find surprisingly refreshing and unconventional is Sadhguru's. He always answers questions in ways I don't expect. Here's a really short clip about self-esteem. And here's one about anxiety.
Finally, what has helped me see my own value is understanding that since every person has a unique genetic makeup, with a unique life history, and a unique combination of interests, etc., that also means we each have a unique perspective. No one will ever see truth in exactly the same way you do. But you will encounter challenges that others can relate to. If you face them and learn from them, you can help others by sharing your perspective, and thereby contribute to humanity's collective understanding of truth. That's a pretty important part to play, I think.
Also, by facing and overcoming your challenges, you will prove your value to yourself. The more you actively live your life, the more obvious your limitless worth will be, not only to you but also to those around you.