If you don't feel sufficient with your infant baptism, then go ahead and get baptized as an adult. If you do, I don't think getting baptized again is necessary.
Paedobaptism vs Credobaptism
The issue is debated: A Paedobaptist Position with R.C. Sproul vs A Credobaptist Position with John MacArthur
If you were baptized as a child but feel insufficient about it, you should get baptized as an adult.
If you were baptized as an adult but feel insufficient about it, then go ahead and get baptized again as an adult.
If you were baptized as an adult twice but feel insufficient about it, you must ask yourself: When will it be enough?
The usual practice is that you get baptized exactly once.
See also Is baptism necessary for salvation?.
Paedobaptism vs Credobaptism
The issue is debated: A Paedobaptist Position with R.C. Sproul vs A Credobaptist Position with John MacArthur
If you were baptized as a child but feel insufficient about it, you should get baptized as an adult.
If you were baptized as an adult but feel insufficient about it, then go ahead and get baptized again as an adult.
If you were baptized as an adult twice but feel insufficient about it, you must ask yourself: When will it be enough?
The usual practice is that you get baptized exactly once.
See also Is baptism necessary for salvation?.