Well, what else could you do to be like Lara? You could own three houses, have twin pistols, or be privately schooled until your 21. Sadly, not all of us have that much money, so you could do things alot simpler.
Dress Like Lara
And no, you don't have to go around in tight shorts and a baby blue top! Boys and girls can dress like Lara, there is cosplayers afterall. You don't have to wear the exact same things. Have a blue shirt and brown jeans, or a tankini (Whatever one of thoses are). Comfortable variations are probably better, but if you like you could get outfits that are rather the same.
Talk Like Lara
I'm sure every Tomb Raider fan does it, I know I certainly do, because whenever I talk about Lara this strange aristocratic tone flows into my accent. But sometimes its just fun to talk like it. It also says that you can speak properly.
Well thats all I can think of for you. I hope you all understand what has been wrote and like it. Good luck on being Lara!