[Stu]

Im a Sagittarius so lets dissect this thing......

half man and half horse

Im all man.

you aim high with all your goals

Like my ambition to sit around my parents house for all eternity stoned off my rocker?

You are honest and outspoken

Ill give you that one.

thirst for knowledge

If by 'knowledge' you mean 'cheap lager'.

a natural teacher

And a poor student...

too blunt and tactless which can hurt others

Hey at least im sharp and tactfull at it!!!

physical activities

I can think of one but I do it indoors. Under sheets.

optimistic

About what? The heap of garbage ticking time bomb we are flying through space on?

expanding your mind

I can think of a few ways I do that!!!

may travel

I will go as far as the chip shop if your lucky.

as you get older.

At this rate , I will be lucky to make it to thirtysomething.