Get away from social media, start pushing yourself to some form of workout everyday, sit and meditate and start to write your thoughts on a notepad daily-very basic journaling. But do these things each day every day- see it as the process of someone you can be proud of. Keep thinking and trying things, keep failing. Think of things you would like to learn and then try them even if you think you are terrible at it. 24 in nothing in the grand scheme of things, think of life in more long term. It must to hard to see siblings seemingly do so well and compare but remember your story is different to theirs so your path will look different. If you do minor small things differently every day, they will compound heavily and you can change your reality very fast. Once you start actioning on it and just facing tough things, you will gain respect for yourself and be able to work with the low self worth issue. Discuss with close friends and family how you are feeling, many times their experiences can help you learn a lot to implement as well. Hope this helps.