You might also be a watercolorist! We all fall for pigment paranoia (I don't have enough!), not to mention equipment anxiety, and that's even before confronting the blank canvas.
There is a cure for this madness. Go out and paint. Stay in and paint. Just effing paint! You might be surprised, amazed and delighted.
BTW, watercolor is considered by many to be the most daunting medium, because correction is most difficult (but not impossible always). A foray into a more forgiving medium could help. And gouache is really just opaque watercolor, mixes well with transparent watercolor, BUT it's correctable in many ways. Just 3 primaries and an opaque white in gouache with your watercolors may help ease the pain.