Among the reasons not do something, learn a language, get a degree, lose 50 pounds, or whatever else you can think of, is the idea that it will just take too long.
Come to the dojo and try Aikido for three months and at the end of it there will be the feeling "I'll never learn this, it will take forever." It's not true. Aikido is learned incrementally and it will take years. Some things might take decades. So?