Do You Believe Therapy Helps Everyone Looking For Help?

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Training with therapists is a big issue.
Anyone can legally hang up a shingle saying therapist and get away with it: it's not illegal.

A decent psychotherapist/counsellor should have the minimum of a degree in psychology, at least one specific period of training in one of the styles of counselling, a four-year period of internship, registration and licensing with their association, and regular weekly supervision.

Research has proven that no matter what modality of therapy is used, the most important factor in therapy is empathy. If you feel the beginnings of rapport within the first session, that's a very good sign. If you don't feel it by the end of the 6th (which I think is already far too long) then it's best to look for someone else.
When looking, try to find someone who is an expert in your issues.

If a therapist shows up late, you have the right to discuss it with them and to ask to have the full time or at least the extra few minutes next time. The standard "hour" is 50 minutes - which allows the professional time to make notes, and to emotionally prepare themselves for whomever comes next. If they keep being late, you can ask them if there's a better time when they wouldn't be late. If that doesn't work, you can tell them you're leaving because you're not getting your money's worth for their time. In a sense, that could be considered a boundary issue.
Would it be a common thing for you to notice someone doing something that inconveniences or costs you, not say anything about it, but carry it with resentment? If so, does it lead to blow-ups?

It sounds to me like you already have an excellent awareness of your bad habits, and that it would make no difference if a therapist or other person were to point them out to you.

If the therapist subscribes to CBT - which is by far the most common modality, they will deliberately not react to or point out anything "bad"; to acknowledge either positively or negatively is considered a way to feed it.
Rather, the usual method is to try to get the client to take responsibility for their own healing: to lead on the issues they consider most urgent, and to initiate self disclosure.
The therapist's role is usually to be a mirror: to actively listen and validate the client's reality.
Sometimes they might "re-frame" something to show a different way of interpreting a recent experience.
In a sense - the therapist acts as a sounding board, the way an ideal parent or friend might act as a confidant. The very act of being able to share deeply is itself where the healing takes place.
We pay for it because, in reality, very few friends or parents have the ability to do that - unless they themselves have learned empathic listening and communication skills, or have been through successful therapy and love going deep.

It sounds like what you'd really like is to deeply explore your childhood and learn how it has influenced the way you are now.
If you find therapists are not helpful, perhaps you might find self-help books of more use.
Some offer the theory - how specific types of parenting and environment affect children and the adults they become.
Others offer open questions, workbook style, that help you remember your past and understand your particular emotions reactions.
An example is Melody Beattie's "Codependent No More" and "Codependent No More: Workbook".
There are other countless varieties - at least one to cater for each specific issue.

I don't think it helps, especially talk therapy.
Some people might feel it helps because their medication is suppressing their symptoms but I don't consider that as helped.

I believe therapy helps those people who are willing to receive help.

i had therapy back in 2000 from a fellow italian male psychologist, it was helping a lot but then i got discharged from the psychiatric hospital i was having therapy, so i never finished the therapy....i had therapy recently again from a female psychologist and it never helped one bit, she was useless really or should i say her approach was useless.

so i think a lot depends on the psychologist you get and their personal experience.

If one therapist after another has let you down, maybe it’s time to find one who can lead you into an exploration of why you’re so resistant.

I saw a therapist as a child. They said i was attention seeking. I got all the attention after. All on my bottom.