You do see that in your latest post, you explain completely a very strong logical argument for why you now feel inferior, don't you? You have actually reached a conclusion to the 'Why do I feel inferior?' question.
You felt bad when you were a kid, and you felt that nobody could help. The reason that you felt nobody could help was because, despite their intentions, you felt that your parents didn't have your back. You felt that your parents didn't have or wouldn't exercise enough power to do something to stop you feeling bad, i.e. you weren't worth finding a solution for.
You felt that you weren't worth it. That was your childhood training. You are a completely normal person with completely healthy boundaries and responses: you learned from your training. The problem isn't you, it's that you weren't trained well.
When we become adults, it doesn't mean that we don't need to be parented any more. It means that we are old enough to parent ourselves. So, you can now do a better job than your parents did. You can have your back. You can give your feelings the importance they deserve. You can prioritise you.
I remember the day I realised I was responsible for myself. Not in the 'I have to pay the bills and go to work' way, but in the 'designing my life/love/company I keep/diet I eat/absolutely everything that happens to me' is up to me way. In the 'I have a fully grown adult human to mother, here!' way. It scared the crap out of me. The 'Oh my god, I actually have to look after me, emotionally, as well as physically and practically!' thing was terrifying. But only for a minute. And then it was like the sun came out, and I realised that if I was responsible, that meant that I was in charge... I was in control... and there was no need to be scared.
You're the boss, @confusedlots . Work out what you love. Work out what you respect. Spend some time doing those things, and you'll be fine. It's all about responding to your feelings, rather than judging them.