I have been in a similar situation.
There were periods of my life where I was socially isolated, and there were periods of my life I was homeless.
In your home country, it is hard to find work if you are unemployed as bosses think there is a negative you are hiding. I was also depressed but I gradually got better when I changed my lifestyle and environment.
I'm seconding the idea of doing fruitpicking in Australia.
Although the pay is terrible as they pay by the bucket and not the hour, it's work outside and you'll get to meet young people from around the world.
You will have to apply quick though, as the cutoff is 31. Here is the website.
It is a great place to make friends as you have a common purpose and background. You won't be the only person coming here to change the trajectory of your life. The language barrier and cultural distance will hide a significant amount of weirdness you might worry about, (I am fine now but I was super weird when I was younger). As for girls, well, backpackers are more adventurous than usual and they are far from anyone who might judge them. I accidentally ended up in bed with a cute Japanese girl (I also managed to somehow misread the situation and messed up, but that's another embrassing story for another time).
You'll have to move around to different places due to the seasonal nature of the work and the terms of your visa, but this will be good for someone who thinks their life is in an unchangable rutt. Do you have a German drivers license? If not "no worries", but it'll be a bonus.
As for the virginity thing, I wouldn't obsess about it. Improve your life situation and your social skills and the girls would come. I lost my virginity in my late teens, but during the years of depression, I found finding love hard too, It gets better, trust someone who has been there.
It might be advisable to just visit a brothel and get it over and done with, it'll be one less thing to worry about.
As for finding a girlfriend, I can probably help introduce you to some people, but it'll be better if you do fruitpicking first to lift you out of your depression.
As for social skills, they can be learnt. Due to illness, I had no friends until I was 14, so I had to start from the absolute beginning Don't worry if you feel like you are not being yourself. "Acting" normal will get you friends, which will help you "become" more normal. I know you aren't aspie, but googling "aspergers" and "social skills"/"Soziale Kompetenz" will get you lots of useful information.
You took a big step being brave enough to share this problem with strangers, so I think you are more than brave enough to change your life for the better. Remember, you are ONLY 31, so it is more than likely you've still got many happy decades ahead of you.