There are different types of meditation and not every type would be suitable for everyone. For example, Budhhist Vipassana meditation is very difficult to practice for extrovert types, a type of personality or hyperactive people. But "Yoga Nidra" meditation, which follows a quick pace moving the focus through different body parts, would work very well in such cases. Many clients have failed experience with meditation. Most of the time it is due to applying one specific meditation technique in a group set-up and as a result, some people would enjoy it and do well while others may experience frustration and feeling of failure.
Also, in meditation one connect to one's internal space, and depending on what one stored in one's internal space, meditation may release emotional and mental blockages, from abuse and traumatic images to unprocessed anxiety, grief, or anger.
In conclusion, not every type of meditation would be suitable for everyone. It would be great to practice appropriate types of meditation under the guidance of professionals.