I'm sorry you are having such a hard time. It's not easy being alone. Though it helps to keep in mind that people in relationships are often miserable. And the people who are unhappy in a relationship tend to work hard to look like they are perfectly happy in public and on social media. It doesn't change the fact that you are alone when you wish you had someone.

I can't tell you not to feel depressed, but is it possible to find something else to give your life meaning like a pet or a hobby you really love? It's just my opinion, but I believe a person looks more attractive to others when they are a complete person by themselves. And there is a better chance for a healthy relationship if you figure out who you are on your own first and meet a potential partner as equals entering a relationship by choice.

And try not to worry about not being kissed by 25. Most people don't go around making out every day. Those who do it in public are probably insecure so they have to put on a show. I think PDA is actually quite rude because it's a form of social competition by flaunting a mate.

You don't need to measure your progress by comparing yourself with people around you. I'm sure you have qualities that others wish they had, just as you wish you have what they have. Finding the right person is more important than finding a mate fast. I hope I'm not coming off insensitive. I just think 25 is still very young and you have a lot of potential.