Dear Glory, may I ask if you have already done some web searches for “Jyotish Ketu first house”? Of course you would have to use your own discernment to decide what might be applicable and helpful for your own situation, or not.
From a brief search of my own, it seems that Ketu in the first house can be either challenging or auspicious or both! And I gather that if Ketu is in the first house, Rahu the Devourer would be in the 7th house — is that correct? What do you make of that?
Maybe it could be that because of karmic development (in a good way) you have turned out to be more of an Observer than someone who participates in society according to the general templates of social interactions.
May I ask if you sometimes find yourself detained by a stranger or someone you hardly know, who unexpectedly unburdens themselves of some private matters, sometimes for quite a long duration, and you find it difficult to politely break away?
If so, it could be that some others see you as a good listener, and in a passive way you offer a gift to them — the gift of letting them share their troubles and regrets with someone else.
[I feel I’m already being too long-winded, so I’ll try to wrap this up soon.]
In my case, sometimes a memory from the past (usually involving self-embarrassment but sometimes an angry resentment) will surface and I’ll react to that as if it had just happened (even decades later), and often more strongly than perhaps I felt allowed to feel or express at the time.
I mention that just as background for some recommendations:
Make a daily or twice-daily habit of sitting for meditation, even if it’s just for a minute or two each time (similar to getting into position for the first push-up or press-up, sitting on the cushion or in your meditation spot is the most important first step, from which the rest follows).
For starters, try the beginner’s meditation of sitting quietly and focusing on the breath, but loosely, with a soft focus, and not trying to control it — this might help you to stay in the “now” more than reviewing the past or worrying about the future — if needed, remind yourself that you can think about the past and the future later, and anything important in those areas can wait until later.
And at other times when you feel off-center somehow, return your attention to the breath and take a moment to appreciate the good things in your surrounds.
Humans are sprouts who can cultivate themselves.
[Two hundred pages later . . . ]
As mentioned above regarding introverts, guarding and conserving your own energy is important. One part of that could be learning how to bring an end to a draining interaction politely.
I would also suggest adding some grounding spices to your tea or diet, and if you like to burn incense, also prefer those that have more of a grounding rather than diffusing influence.
Hoping this helps, and as mentioned in my disclaimer, please feel free to disregard any of this!
P.S. — oh heck! While trying to help I have also treated you like a “listening post” haven’t I? 
