You haven't waited too long. You just said you're 25! You're not old by a long shot so there is plenty of time.

You just need to make yourself go through things, even though you feel it's hopeless. It really does help when something is done repeatedly.

Relationships are a lot of work. That would be much too big of a first step.

Why can't you finish your studies? Don't say it's because you're a failure. Tell me HOW you've failed. Have you flunked all of your courses? Have you dropped out? You can always return (depending on finances).

How do you feel if you are inside a mall by yourself? It's a good location for exposures really. You can just walk/sit around and people watch if that's not overly comfortable for you. You could get something to eat in the food court (this is how I started out with eating solo actually.. food courts followed by fast food restaurants). You could browse in the store for longer than you might otherwise. You could ask for assistance looking for something. You could ask for someone's opinion on something. You could have a brief chit-chat with a teller. Lots of different, little things.

And I say they're little because they're quick interactions that are done and over with relatively quickly. They're easy to repeat, and you don't have to worry about seeing the person again. And if you chicken out about asking for help or something... no biggie, no one knew you were going to ask!

And you can't really wait to be happy. It just doesn't work like that. Just like the alternative doesn't work - you can't decide to be happy and then be happy. It takes time and effort (which really rather sucks because it doesn't seem to take time or effort for lots of people!). So honestly... pick out a goal for something you want to achieve. Make it specific. Saying "be happy" is a terrible goal because it's a huge goal and who on earth knows where to start with it. Going "I want to be able to make an appointment via the phone and not panic" is a much more specific goal that you can work towards.