There is a great deal of scientific evidence that reincarnation exists. Even the early Christians believed in it.
The Christian religious institutions began to suppress this because it did not want the masses to think that there is more than one chance for them. This created fear so that institution can control the masses.
You don't have to repeat the same experiences for each life.
Each life can bring you new experiences. You soul is attempting to experience something new each time you reincarnate.
However, it one commits suicide to not experience something the soul is seeking to experience, then the soul will cause the person to reincarnate again in an attempt to get the soul's desired experience. However, this does not apply to those who commit suicide to avoid the pain and loss of dignity in a hopeless situation where death is imminent.
When the soul has experienced all what it needs to experience then reincarnation will cease and soul will re-unite with God.
Also wish to add that the goal of each reincarnation is not to learn lessons, but to experience and "re-member" your relationship with God.