the worlds are buged

First of all have an excellent morning, afternoon or evening. my report is that all my worlds that I believe from the beginning appear to me drowned, why ?, because it is simple there is no portal of ender dragon, nor the whiter skeletons let me loose their little heads and the enchantments are drowned, for example sharp it's no use it's like I'm not delighted and it's a normal sword I hope you can fix those bugs please because it's not nice that I can't kill the dragon