This is difficult situation for me. Before I say what I think, I'm going to give several cautions.
First, I hate to give an opinion about a situation when I can't examine the patient myself. There could be clues that this "doctor" saw that I don't know anything about.
Second, this "doctor" is possibly struggling with limitations of resources that make it very difficult for him to do what he needs to do. I'm going to sound critical of the quality of the x-ray, but I haven't seen the equipment that he has to use. I don't know how expensive the film or the developing solutions are. It may be that he was also not happy with the film, but felt that he couldn't afford to re-take it.
Third, you and I are communicating very indirectly, and with language limitations. You may not of fully understood the doctor. This happens with doctors and their patients all the time. The doctor tells the patient something in terms that he or she thinks are clear, but the patient misunderstands and is afraid to ask more questions, or the doctor hurries away before the patient can ask. Or the patient feels they understand when really they don't. Then you are using a language that is a second language for you. No insult to your English--you're doing very well. But really, you may not have meant what I believe you have said.
Now. I went back to your original post and re-read it. You said that you have no pain. What symptoms do you have? What made you want to go to a doctor in the first place? What did you think was wrong when you went? Is there anything about you that doesn't work right, except that your back is a little crooked?
The x-ray is not a good one. I just can't make out anything useful. I suspect that the upper part of your back was close to the film, and that your middle back was further away from it. The appearance that some of the vertebrae are "bunched up" is just because the spaces between them are all at different angles, and most are not aligned up straight with the film. They can't be, because of the curvature of the spine.
Part of the problem is that your photo of it isn't very good. If you want to try to take another one, try this. Hang up a plain white piece of cloth that's bigger than the x-ray. Hang the x-ray in front of it, and put a light behind it. Turn off the flash on your camera. If you can see the light bulb through the cloth and the film, you may need to use more than 1 piece of cloth, and it might be better if they were separated by a few centimeters. Make sure that the camera is positioned in front of the center of the x-ray. In the viewfinder or on the LED screen the edges of the film should be parallel with the edges of the picture. Try increasing and decreasing the exposure a little bit. The over-all resolution of your photo doesn't have to be extremely high.
From the photos of you, all I can see is that you have mild scoliosis. That is a side-to-side curve in your spine. That's not likely to be a very big problem for a person your age. You are close the completing your growth. If the scoliosis doesn't get much worse in the next 2 or 3 years, you will probably be fine.
Now, this is the tricky part for me, because I'm going to give you advice, which I rarely do on this (or any other) forum. I think it would be OK for you to do any kind of weight lifting. If you experience pain, slow down, change what you are doing or stop. The advice you were given about lifting is contradictory (that means that different parts of the advice don't agree with other parts) and confusing. If dips are OK, chin-ups are OK. If push-ups are OK, bench press is OK. If it is OK to do stretching exercises, it is OK to hang from a bar, which will stretch the muscles.
I was going to suggest that you try to see another doctor and get better x-rays, but if you don't have any symptoms, I don't think that is necessary. Just lift, eat, sleep, study, love your family and country and grow up to be a strong, productive man.
I would like to know the answers to the questions I asked earlier about what symptoms you had that made you want to see a doctor in the first place!
Our greatest fear should not be of failure, but of succeeding at things in life that don't really matter.--Francis Chan