As a self-learner, what to do with books providing exercises but not solutions? Lately I've been reading lots of statistics books. Many of them have exercises after each chapter that I'm eager to solve, but I'm a beginner and can't solve most of them, and those that I think I can solve I can't check because there are no solutions and no solution manuals available.

I think the point in providing exercises without solutions is that this way the book can be used in class, where the teacher can use them as homework assignments. However, I'm self-learning and have no teacher to ask/to correct my work.

This frustrates me. I like solving stuff, but without knowing even if my solutions are correct (left alone anything beyond that) it's no fun.

What is the best way to deal with this?
Are there any resources on the internet where solutions for the more popular books could be found maybe? Should I trust that trying to solve them is the most instructional part anyway and let go of my childish craving for seeing my and the book's answer are identical?
An inability to confidently answer the questions in a text book in general is an indication of not having mastered the material.* If you are not 100% confident that you are solving the problems correctly, go back and read the material again. You will not be able to use the skills in research unless you know the material without an answer key.

*For a graduate class I used to teach there was a problem in the textbook that I could not solve. No matter how I thought about the problem, some information was always missing. I am friends with the author so emailed him for a solution set. I was too embarrassed to admit I couldn't solve the problem and figured the answer key would be helpful anyways. The answer for the problem in question was "Not possible with supplied information."