Hw can i protect mahself?

heyy m 17+...m defenseless...n harmless....not so physically strong...hw can i help mahself against eve teasin....though it hasn't happn to me...but m a bit scared of it...n i dunn wann mahself to b freakin out if sumthin lyk happns...wat can i do if m alone n dere r not mch ppl arnd!!!! pls help....