Well, being more frugal than necessary is a lot better for your long term financial success than being less frugal than necessary and if you're happy with your life as it is I don't see a need to worry too much about it, but if the frugality is keeping you from doing things that you really want to do and can afford, then maybe you can try asking yourself whether spending a little more on something you want is going to create any financial hardship in the future and if you see that it won't, perhaps you'll feel a little better about doing it. I think you just want to be careful not to loosen up so much that you go too far - like sports stars or lottery winners that have many millions of dollars and then end up bankrupt because they adjusted their spending habits too much.

If it's really bothering you, maybe therapy could help with adjusting your thinking to a level of spending that's reasonable and still financially wise for your situation. But of course you'll have to pay for therapy so you'll have to decide if you think it's worth it.