Lump in my left breast

Ive had a lump in my left breast about 2 years ago and in a couple of months it was gone.... Since about march or may I discovered another, in my right breast.. Im kinda worried because the first one wasnt tender but this one is .. Im kinda worried that it might be cancer.. I have done some research and in those researches it could be alotof things, including breast cancer.. Even tho it doesnt have to be breast cancer im still not certain what it is so until then i will continue worrying :'( please if u can help or if u have advice please share them with me....