Here's Doctor Cranky's formula for enjoying the hobby into a ripe old age:
1) build for yourself to derive pleasure from your skills and imagination
2) always share and be generous
3) if you show your models in competition do so with an open mind and an open heart
4) be happy to build at your current skill level, and be patient . . . everyone learns at their own pace
5) if you want to get better, practice, practice, practice--READ and INFORM yourself, learn from others
6) be willing to accept criticism. CRITICISM is a fact of life. Always focus and listen to constructive criticism.
7) help others with what you've learned, and learn from your mistakes.
8) Don't be too hard upon yourself, but be your toughest critic
9) Remember that building models is about the journey, not the final results
10) Keep your first few models so that you can compare them to later models and see how far you've come in the hobby.
I'm sure I can come up with a longer list, but these are the ones that have kept me going all these years.