When it comes to making decisions, you can spend so much time thinking of the consequences that you miss out on the event. Decisions involve risk, and risk can be evaluated with in many ways. A popular way is by breaking actions up into two parts: Consequence and Probability. Thinking about each course of action, evaluate the possible outcomes from -5 to +5, where -5 is the worst possible consequence, and +5 is the most favourable. Then work out the probability of each happening, from 1 to 5, where 1 is almost impossible, to 5 being most likely. Mutliply the two together, and sum the outcomes for each action. The highest score is the action with the best chance of producing the most favourable outcomes. It's not easy, but when you have weighed the risks involved, and made your decision, STICK TO IT! Don't waver. Being wishy washy never helps anything.

Remember that very, very few major life decisions are absolutely irrevocable. If you find that your choice was not the best, there are ways to turn it around. If you choose a career that you end up not suited for or don't enjoy, you can always find a new one, possibly building on the education that you already have. If you enter a relationship that ends up badly, just learn from it and move on - many of us have and have come out of it better off. I am not advising anyone to give NO thought to the future when they make decisions, but I am recommending that everyone keep in mind that we are all human and all fallible. I don't believe that there is only one right decision to make in most situations, but many of your options can work for you if you handle them well. It sounds like your major obstacle is risk aversion. You don't feel confident in dealing with the possibility that your choices may not turn out well. Perhaps you have a small streak of perfectionism as well. Realise that there are no perfect choices. Cut yourself some slack and try making small choices with a degree of risk - you will realise that your greatest fear about what might happen is probably mostly in your mind. And don't worry about what others might think of you if you don't succeed every time. They won't think any less of you for falling off the horse, but their opinion of you might suffer if you don't get back on again.