weight
Everybody carries there weight differently. So its hard to say what you look like at 105 pounds. For instance, many people guess me to be 5 to 10 pounds lighter than what I am. But in any case, rather than looking at the numbers on the scale, you should instead look in the mirror(please understand that my tone is very kind here). Do you think that you look nice and lean or too heavy? If you are happy with how you look, by all means, stay with your weight and continue to do what you are doing.
One thing I can comment on is that you said that you would like to become more muscular. If that is the case, then I would not suggest that you lose weight because that will make it a little harder for you to become more muscular. To build more muscle, you would be better off eating a few extra healthy calories rather than cut back on them.
Good Luck!