Is it possible for me to learn to sing tenor?

I think I'm a baritone, I'm pretty sure. I'm 14 and my range is from G2 (2nd G below middle C) up to C5 (the C above middle C) not including my falsetto. The part of my range from G2 through E4 is strong. But everything from F4 through C5 is very squeaky and strained. The only time F4-C5 begins to sound stronger is when I work my way up on a scale. I've been told that I have a very light tone to my voice so it sounds that I am singing higher than I actually am sometimes. Is it possible for me to smooth out F4-C5 and be able to sing tenor? I've been singing for about a year and my range was only from C3-C4 when I first started.