Just to add to the last comment, many people who get a psychology degree do not become a psychologist, or even do anything related to psychology (because it's a competetive career to get into, or people simply dont want to), so it's not always about whether you will like the job, you have to really be interested in the three years of study as well to stay motivated.
The content of your volunteer work and counselling course would probably be touched upon in a psychology degree, although probably only briefly.
A psychology degree is far from just looking at stats all day (although this is part of analyzing the data gathered during an experiment, and you'd probably have lectures on statistics throughout the degree). Neither is it rote learning of what psychologists think. Although you would look at the studies other psychologists have conducted to gain understanding of their methods and findings, and what the findings mean in the real world.
I don't know what other uni's do for the experimentation aspect. But here we'd do a practical (i.e. experiment, asking a question, collecting data, analysing what the data means in order to answer the question) and then write up a practical report (saying what you did, what you found, how it relates to what other experiments have found). Experiments are a reasonably big part of a psych degree. and generally in your final year you would do one big experiment.
As for maths, you dont really need to understand maths to understand statistics in psychology (although basic algebra helps). As statistics is much more applied than maths at school/college, and is taught as a distinct subject from the beginning.