You did the right thing. Like with physical wounds you have to let mental health concerns out in the open air so they don't fester and get worse. Thoughts like this do happen to most people at one point or another, but if it's happening often enough for you to feel the need to tell someone, you should definitely take it seriously.

If you have the option, I very much recommend a therapist. Worst case scenario you stick it out for a bit before deciding it's not for you.