Scratchy , high pitched voice

Ok first of all,I am 30 yrs old. I have had a scratchy,cracked,high pitched voice ever since i was a lil kid that I can remember. I thought it would get deeper when goin through puberty which it did a little bit I guess?! But people talk about me the way I talk. Most of the people I talk to that I don't know always ask are you sick? I just say yes now so that is my excuse for my voice. If I have to make a phone call,people will be like "maam". This is so discourageing. I am really out going and joke alot around friends and family. I think if I had a deeper voice I could get more in life. I worked at a car dealership as a detailer but I wanted to be a salesman,so I went and asked the new car manager and he said said no,and I know why...Is thier any thing i can take or do to get my voice deeper?!