According to me, your concerns are:
1. No Training
The company had preferred you as a trainee and given you the opportunity for on-the-job training. On-the-job training is the most used and effective method of training. Sometimes, due to various reasons, organizations do not use other methods of training. It doesn't mean that they are not training their key assets. At the same time, continuous learning and development is the responsibility of the employee as well, so try to learn as much as you can from your seniors, colleagues, friends, online resources, books, etc. Try to understand the needs of the business and your role, and focus on it. You will get positive results.
2. Mental Harassment
It is subjective, and without knowing the actual facts of the case, commenting on it will not be right.
You are new in the organization; learn fast, work hard, and show results. There is a well-known proverb: "Trust and respect are two things which everybody has to earn." In spite of all your efforts, if things do not improve or you are not happy, then it's time for a change.
"Life is too short to wake up with regrets. So love the people who treat you right. Forget about those who don't. Believe everything happens for a reason. If you get a chance, take it. If it changes your life, let it. Nobody said life would be easy; they just promised it would most likely be worth it." ― Harvey MacKay
Welcome to corporate life, and best of luck.