I masterbated alot over years. now can't get erection will it restore over time. 20 years old?

Yes: I'm assuming you described yourself as a 20yo female in error as women don't usually have erectile dysfunction like men. In any case, erectile dysfunction in young men is usually due to stress & anxiety rather than any medical condition (unlike those associated w/middle age & beyond). Stress & anxiety can derive from performance anxiety, relationship status, academics, work, finances, etc.