21 year old had mitral valve repair for leaky valve but after cardiologist told me still see a little leakage is this normal? will it get worse

It is probably ok: It is hard to absolutely answer your question without actually seeing the echo and knowing what was actually done in surgery. Ideally after repair we would like no leak. It is not unusual to have a small leak after. Typically this will remain stable and you won't need anything done in the future. Your cardiologist and surgeon are going to be your best source of information, however.

Not unusual: Good repairs may still have some leakage and never need anything more than echo followups. However, some do fail over time and need re- repair or replacement.