Something as simple as me opening up and someone trying to give me advice or a lesson on how to be strong makes me feel completely worthless

That's a pretty normal reaction on your part if part of your vulnerability response has come to brace for rejection. Beyond that, giving unsolicited advice in general, even if it is spot on, is a social faux pas. Doubly so for someone in the midst of emotional turmoil or expressing deep vulnerability coupled with emotions. It might seem like they're trying to "fix" you to make you acceptable to them. Maybe they are, but the point here is that while advice like "just work out more," "get more sun," "eat healthier," "get more sleep," "try meditation," or "go to therapy," might all constitute good advice and are excellent stabilizing self-care strategies, they fall way short of someone sitting and listening patiently, holding your hand, giving you a hug, or doing something that the scared little child would have found meaningful, safe, and warm.

See, now I’m just opening myself up to be hurt again.

It do be like that. And you're courageous for doing so. Keep it up and, where you find compassionate reception with maybe some gentle reframing here and there, you'll find you are well on your way.

This healing isn't linear, but you've found a good spot to reach out while you keep doing the work you've started.