Should I tell her I like her even though I know that she doesn't like me?

Hi,

There is this female friend that I like, who I have been friends with for a couple of years. I'm not sure if I should tell her that I like her or not.

From all the signs (eg. body language etc.) and hints that I got, it seems like she is only interested to be friends and nothing more.

The reasons that I want to tell her is to let her know how I feel and also to let her know that there is someone who like her for who she is and cares for her. I know i will get rejected but I'm just thinking if I should just let her know.
In the meantime, I'm also afraid that the friendship might turns awkward if I confess.

So should I just tell her straight that I like her or just let it be?
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Should I tell her I like her even though I know that she doesn't like me?
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