Most families are dysfunctional, to a greater or lesser extent. So many people come from dysfunctional families.

Sure; if the custom in your family when faced with problems is to drink or drug, then it won't be surprising if you take the same approach.

My limited experience of people from flawlessly functional families is that they tend to be - um - boring. I find people's flaws and weaknesses make them more attractive and interesting. YMMV.