Stop being so neurotic.

I’m generally quite a chilled out person. I have a good blend of logic and intuition in my head that I try to listen to evenly, but sometimes (well, most of the time, recently) I just seem to stress and panic and worry over EVERYTHING. I overthink things to the point of near-madness. One example…I have long-ish dark brown hair. I love it, but sometimes I get the urge to cut it all off (bob-length) and get bright red streaks put in it. I did it once and loved it. Eventually I got bored and wanted it long again. Problem is, my attitude towards hair is the same as clothes – it would be perfect to be able to change it whenever you wanted, adapt it to social situations/mood etc at a mere whim. But unless you’re Tonks from Harry Potter, it ain’t gonna happen!
So the mental process is as follows….I’d like to cut my hair, but I like it long today, I love my colour, but sometimes its so boring, but red would be awesome!, my friends girlfriend has hair like it, I don’t want to copy her, but I had the idea ages ago, but she’s so popular, maybe I’ll be more popular with red hair?, but my boyfriend wouldn’t like it, but it’s MY hair!, but what if he doesn’t fancy me anymore?, and is it appropriate for work?, but if I don’t do it while I’m young then when can I do it?, might look pretty stupid at 40 years old with red hair, no I won’t, but now I think I want to go blonde….and in the end, it’s all academic because I have no money for a haircut anyway! And I get reeeeeally neurotic about it, like it’s some kind of life-or-death situation and that if I DON’T make a decision, then I feel cheated, or like I’m missing out somehow. It’s just hair!!!
The problem becomes serious when I start thinking this way about my relationship or by job/life etc. On paper, life is fine! Life is good! Sometimes great! Same goes for my relationship. So WHY do I have to contantly question it and myself? Why can I not just be happy? Tell me it’s not just me that thinks she’s messed up in the head…? :/