Help with highschool advice

Hi, I'm 19 about to be 20 in a month, Im in sweden and have a year of high school finished in a different European country, but then I moved and it basically all got messed up and I have messed up on my part as well. But basically is there any online highschools I can do? Which will be valuable enough for me to continue further education after it such as university? If you have any suggestions on what I should do please reply to this post. Regular highschools are out of the question because I don't think any school would take a 20 year old in. Also I heard about komvux but I don't know any Swedish and am curious what's options do I have for getting a highschool diploma as soon as possible. Any advice is very welcome.