Owning a boat is good. Having friends with boats is in some ways better.
There's no hurry to buy your "ultimate" boat, because your needs and wants are likely to change as you learn more about sailing and want to try out different kinds of sailing.
Some people start with small boats and work up; some jump into a bigger boat; and some crew for others, charter, or join a sailing co-op or club. For some people, learning basic sailing on a smaller boat and then crewing on several other people's boats helps broaden their experience rapidly. It all depends upon your needs and situation.
Conflict of interest disclaimer: I have a MacGregor 26 swing-centerboard sailboat to get rid of... and will still probably have too many boats.