Please provide some quotes in Act 1 that define Romeo's personalty.
I, measuring his affections by my own,
That most are busied when they're most alone,
Pursued my humour not pursuing his,
And gladly shunn'd who gladly fled from me.
Montague notes that Romeo is depressed:
Many a morning hath he there been seen,
With tears augmenting the fresh morning dew.
Adding to clouds more clouds with his deep sighs;
Montague also notes that Romeo won't talk to anyone about his problems:
But he, his own affections' counsellor,
Is to himself--I will not say how true--
But to himself so secret and so close,
So far from sounding and discovery,
Romeo himself says he is sad:
Ay me! sad hours seem long.\
And that he is in love:
Out of her favour, where I am in love.
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