How do you know if you should go to therapy/couple therapy?

There’s been a lot of strain on my relationship for a while, but this isn’t the only reason that I’m considering therapy/couple therapy (my s.o. is considering it as well). I just feel like it may benefit me as a person and I’m also a little nervous about seeing a therapist in an unfamiliar setting with my significant other.

I’ve tried talking to a counselor at my school and I didn’t have a very good experience, he didn’t seem like much of a help.

I’m scared that my problems may just be petty problems that a person should be able to solve without therapy and I don’t want to have the same experience that I had with the counselor.
Does anyone have any experience/advice with therapy?