Mr_T_67 (45) from Strathclyde

I was advised to 'sell myself', as it were, on here. How does one do that without coming across as cocky and big-headed?
If we're going with appearance, I'm six feet tall, blue-eyed and blond, and looking five to ten years younger than my real age. Living in Glasgow, I'm often referred to as 'big man', but I reckon that's due to height more than build.
Some terms used to describe me.....smart, easy-going, humourous (a mainly dry and dark sense of humour, with a good sense of the ridiculous thrown in), gentle, polite, considerate, intelligent, reserved, handsome, 'nice guy', elegant (I know....it surprised me too when I heard it, but there must be an element of truth), clean, honest, and open-minded (but to a degree)...just some of my good points. On the other hand, I can be quiet and need some 'me' time now and again.
In many ways I'm just an average guy.

In fact, I'm really struggling with this. I've never done anything like this before, so I don't know what to say. I'm trying to be honest, but perhaps don't have the self-awareness or self-assurance to be able to present myself accordingly.
One thing I do feel is that I express myself better through the written word than the spoken word, so if you wish to communicate through email/message and text, then I might be your man. However, I'm kinda looking for some physical connection too, ultimately, and unless my passing you a note reading "How about it?" is an acceptable prelude to foreplay and lovemaking, then we could have some problems here. (That's an attempt at humour, just in case you thought otherwise)

The reason I signed up to this dating website is because I reckon I was conceived on a midsummer's eve, or damned close to it. Is that crazy talk?

Ideally, I'm hoping that one day I'll find someone whom I shall never wish to part from. That said, this person should have strong compatability. That's why I've put the friends/hobbies thing down too. If we can share interests and experiences, then there's a stronger chance we can build something stronger.
However, I also believe there has to be a mutual physical attraction too. So, if distinctions have to be made, I prefer a taller, slimmer woman, although petite has its charms too. As I'm lucky to look a bit younger than I am, I'd prefer someone a bit younger than me too.
There's an inner narcissist here, WLTM similar but in the female of the species.

Like I may have mentioned above, I've never done this before, so I'm at a bit of a loss as to what to say. I kinda like the way that an internet introduction gives a chance to dispense with some of the bullshit and just be honest from the off, but still, it feels a bit strange when you're not used to it.
As I think more on this, I'll add or remove as required.
Forgive me if it's offensive in any way.