Is it normal to be cold all the time?

So my boyfriend and I live together but I'm always cold my hands my feet and my nose everything about me is cold and I don't know why he keeps the heat set at 70 but unless its 80 or higher I'm freezeing always have goosebumps could something be wrong. I have gone to the dr to get tested for animea and all that and he says I'm fine but am I really what is going on I weigh about 114 and I'm gonna be 20 here soon and I'm about 5'3 could I be underweight I don't know it scares me.
Is it normal to be cold all the time?
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