Hello! I understand that some people may tell you that you're too young to be worrying about this stuff, but that's an opinion. However, this is the beginning. This is where you can start gaining experience in relationships.
Joining a LGBT group is a great idea. Not only does it help build confidence, but the people in the group may know of other lesbians in your area. Not to mention it's just fun being in groups sometimes. Taking things slow is always a very good idea. Get to know the person. You have to be friends with someone before saying them, otherwise it's saying a stranger and that's dangerous. Even if it doesn't work out in the way you hoped our if you decide you don't want to date that person, at least you've made a new friend and learned something from the situation.
Of course dating isn't the most important thing in life. Keeping up previous relations is just as important. The media tries to tell our generation that we are nothing if we aren't in a relationship. That isn't true. You are a wonderful person just the way you are, and there will never be another person like you. If you want to be in a relationship, that's also fine. Just make sure you keep track of yourself, and be aware of your actions. In the end this is just a jumble of words submitted by some stranger. Be safe, and good luck with whatever you choose to do.