What do I tell people when they ask me if I like girls or guys if I am a closeted lesbian? I feel like my responses are usually unsure and awkward and it seems to hint at it..

A great response in these cases can be "I like people who mind their own business"! Or if it sounds to aggressive, you can just say "I like people who (and insert here litterally anything)". According to how you phrase it, you can make it sound as a joke, if you think it's the best way to get out of it.

Don't be ashamed of hiding how you feel. Sometimes, you don't want anyone to know that you feel different, so it's best not to tell the truth. In those cases, know that you are just trying to figure things out, and the best way to do that is to say that you aren't different (that you are straight) even if that's not true. Eventually though, it will come to a point where you will no longer want to hide. In your own time, feel comfortable enough in yourself to express how you feel proudly, but until then, don't feel ashamed of saying that you are straight.

You don’t owe anybody an answer unless you’re comfortable giving it. If you feel safe coming out, then a casual up-front ‘I like girls’ response is great! If you’d prefer privacy then it’s okay to deflect by saying ‘does it matter?’ or similar . People don’t have the right to have that information unless you want to share it, and remember you have the right to be treated with respect whether you choose to answer or not. It’s always your choice whether you decide to answer or not. Coming out can be a life long process, and it gets easier with time.