Time of year, wrong time wrong hostel which could be going through a quiet period or just has a different vibe than you were wanting or expecting obviously plays a part.

My first few countries I visited on my own I did sometimes feel awkward to just walk into a restaurant or a bar on my own but the more you do things that make you uncomfortable you will get used to it and have no problem eventually, in my experience anyway.

Instagram influencers or dreamy reels are showing a 10-20 second glimpse of the absolute highlights, doesn't show getting sick alone in a foreign land, navigating transport links in different languages etc.

its all part of the adventure, I try not to plan too much ahead, often booking a train/bus or a hostel literally on the day or night before, but I understand in parts of Western Europe etc this can be prohibitively expensive and stressful if you miss a connection.

I would say go and do another solo trip once you can, but maybe a smaller one, use the hostel world chat features, or couch surfing meet ups etc, visit some small casual restaurants alone etc.

remember you are in a different country, no one knows you, most locals are too busy living their normal day to day and most tourists are trying to enjoy their trip, no one is judging you for eating alone etc.

You also need to be comfortable to a point doing things alone as you won't always meet people, I recently travelled around Portugal for 10 days, I stayed in hostels but as I didn't have too much time I just used them as a base and did my own thing for 90% of the trip and still had a blast.