Love per
se isn't some mutually exclusive entity living on its own dimension
- in fact, it's very much interwoven with one's life.
I see this as two possibilities:
I) You are naturally weak in communication, self expression and
delivery (Mercury-detrimental).
II) Your lacklustre life doesn't give you enough variety to keep
conversation going.
And chances are, it's likely to be a mix of both because these two
pointers are highly intertwined.
Personality trait can be an acquired skill if you reiterate enough
to behaviour to infuse it as part of your core value. But you must
first understand where this defect lies and if you are equipped
with the strength and wisdom to strike out and start a human
revolution.
A dull person is languid because the way they lead their life
probably doesn't give them the opportunity to expand on human
interaction. These people are likely to invest their time in
solitary activities that usually doesn't require much personal
interaction between people.
And the flourish of internet probably worsens this issue, if people
start reckoning that it's a good substitute for reality.
Love is not a miracle that dissolves all problems into nothingness;
ironically, being in Love is like looking into a magical mirror of
truth: it expose all our inner negativity and coerced us to face
directly with our weakness, especially our personality.
Only through the
eyes of Love, would we understand how much 'defects' we have
developed unconsciously over the years.
A person who doesn't know how to speak must learn to challenge
himself to talk. Albeit he might not be the best speaker, but at
the very least, he learns to speak, which is paramount to one's
spiritual growth. The growth doesn't lies with the ability to
speak, but rather, the notion of having to surmount his
weakness.
A dull life is but a transitory condition that can be shattered by
having to invest your life, effort and time into something more
worthwhile that could enhance your personality and life, especially
if it involves an assembly of people, in which one must interact in
such social setting.
One can be insipid, but one doesn't have to accept the fate of a
dull life. For everyday, there's always 24 hours for all. The
difference between one from another is the time used by them
individually.
In summary: one cannot be a dull person that is interesting or an
interesting person that is dull. Being in love doesn't make you an
interesting person automatically - if your current life doesn't
allow you the condition to be interesting, you will always feel
inadequate in conversation because your vocabulary is
limited. 
Cheers
