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It is normal to lose erection after ejaculation. Some young men can achieve another erection quickly, but this usually passes as the man ages.
However, if you are having difficulty with ejaculations that is happening quickly (called premature ejaculations), then there are treatments that can be done for this. The first-line treatment is an specific class of antidepressant, the SSRIs. One of the side effects that was discovered when these drugs were first used for depression is delaying ejaculation. So, the drugs were then tried for premature ejaculation, even in men that are not depressed, and they are frequently effective.
If I can provide any additional information, please let me know.