I'm not clear on this. Are you saying, "I just started singing and I don't sound very good."? Or- are you saying, "I've been singing for years, first in a choir, and then with a vocal coach, 3 years with a cover band, and 4 years solo, but Simon Cowell and Randy Jackson said they'd murder me in LA, and Paula laughed at me."? If it's the second one, the answer is- keep your day job.
If the answer is the first one, start by accepting that your voice is an instrument you have to learn how to play, and that takes time and tons of practice. And- just like playing piano, guitar, or violin, taking lessons can save you a lot of that time. Just remember that in singing, the instrument is you. When you damage the instrument with wrong technique, you hurt yourself, and you can't buy another one. Also remember that when you were born, you went to the instrument store of random probability and genetics, and they gave you the only instrument you'll ever get- for free. Some people got the vintage Martin, some people got the Hondo. Me- I got stuck with an Ovation with a straight neck. Then you have to learn how to play it. A guitar god with a cheap guitar will always sound better than a clueless beginner with that old Martin.
If you get that cruddy instrument, and learn how to play it, you could become Bob Dylan or Willie Nelson. If you get an average instrument and learn how to play it, you could become Elton John, Alice Cooper, Stevie Wonder, or Billie Joel. If you really do get that old Martin, and you *really* learn how to play it, you become Freddy Mercury, Charlotte Church, Dolly Parton, Nat King Cole, Barbara Streissand, Aretha Franklin or whoever. If you really got stuck with a lousy sounding voice, you'd better have a good story to tell. If your story is good enough, your lack of that big voice will likely be overlooked.
Don't get sucked into the myth of "talent". Singing isn't something you are born with. It's something you learn to do. The first step- sing along with the music you love every day, and develop enough of a thick skin to tell the people who tell you to shut up to screw off. Eventually they'll stop, then they'll *ask* you to sing. Then, they'll pay you for it. Join a school or church choir. Learn to use microphones until you get over the fact that your voice doesn't sound the same coming out of a speaker as it does when muted by your head. Every singer went through that. Get over it. Just don't stop singing, and you'll do fine. Ask me the same question after you've sung at least an hour a day for five years. Good luck.