Seriously?!

So, I'm sitting here thinking about "seriousness".
When I was a child, I took pretty much everything seriously. Don't ask me why, but i was under the impression that I was a good Catholic Boy, and in order to be the best Catholic Boy ever, I had to take everything seriously.
Now, it's a little different/
There are precious few things I take seriously:
1. Houses/architecture
2. My friendships
3. my job, to an extent.

Everything else, I guess I'm pretty cavalier about; whether it be sex, which I'll get to later, or money, or like speed limits, romantic relationships, food (to an extent), and surprisingly, my music.
I take voice lessons, but I find myself practicing close to never. That's kind of a problem if I ever want to improve....
What is my issue?
Do I think I'm better than practicing? Above it?
I was contemplating this as I was walking in the blazing heat to voice lessons today.
I have found that most all things I commit to I like flake off in some way.
With the gym, I went but did I work out and improve my body? not really.
Voice lessons...am I talented? yes. Do I practice? no. Will I get better? not likely.
BY THE WAY
strawberry ice cream with chocolate jimmies is delicious.
Back to the point.
I think this lack of commitment is part of my nature as a Sagittarius. Procrastination is also part of my personality too, so that contributes.
But now to the big ticket item, sex.
I'll admit it, I like sex and I hook up every now and again. Certainly not on a regular basis, but if I'm feeling particularly sexual on a given day, I'll contact someone.
Then, when I was visiting my friend, he brought up the issue of "using my body to get what I want".
I thought that was good for me to hear, because in a sense I do. I certainly don't whore myself, but if I want sex, it's not a problem to get it.
I'm just very divided on this issue:
on one hand...
what the hell is the big deal?? I LIKE SEX! So what? everyone else and their mom does, but am I the only one willing to discuss it and be liberal in sex?
then on the other hand...
all my friends think I'm a cheap, easy manwhore.
I've been with a total of four people.
I really don't think that's bad at all.
Four.
out of like however many billions there are on the planet.
Despite my natural tendency to defend myself, I do see their point, because I've never had sex with someone I really liked and cared for.
However, that is simply a problem of finding the right person, and waiting I suppose, two things I'm not very good at.