Does anybody else have this problem?

So... I'm only just realizing that whenever I buy something for myself, I'm weighed down by this guilty feeling. I haven't really noticed it before now, but now that I've been thinking about it I'm finding that it isn't something new or all that uncommon for me.

Right now, I want to buy an ukulele. I've always wanted to be able to play an instrument so bad, that sometimes I actually get depressed that I can't. Ukulele's have a bit to do with Hawaii's history/culture and I love EVERYTHING about Hawaii so it's not like I want it just because it'll be an easy instrument for me to start on. Plus, I can buy one for a rather inexpensive price and I've been seriously thinking about it for months now, so it's not like this is some sudden decision I'm just making on a whim.

YET, last night I was on eBay, found a good deal, I could hit the "but it now" button, it would be here within the week - and I'm hesitating.

I always have some sort of thought of why I shouldn't be buying something for myself. Whether the money I'm using is some I've earned or it's a gift, I feel like I shouldn't be spending it, I should be saving it. Or spending it on someone else - maybe someone's birthday is coming up.

I'm never just... fine with it.

Does anybody else have this problem?

How do you deal with it?