Despite what animal rights propaganda has to say, the temperament and behavior of your dog is NOT all about how it is raised. Genetics play a big factor in what you end up with (citation: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4977763/). Dog breeds were developed to serve specific purposes, and their traits center around that (i.e., a guardian breed will have some aggression, a sighthound will want to run, a pointer will point, etc). Researching breeds and knowing your own limits will provide you with an easy pet that you will enjoy, compared to a difficult dog you are always having to work around in order to be happy with it. This decision will stick with you for the next 10-20 years, so set yourself up for success by getting a dog breed that fits your lifestyle.