Limitations to my model..correlation? endogenity?

[ce123trf]

I am trying to estimate the effect of public investment in infrastructure on GDP using OLS.

I have put it through Eviews and found that public investment does have an effect on GDP.

But I was wondering that because GDP probably includes public expenditure in the statistics, will this have an effect on my results?

I mean, will be results be overstated because essentially public expenditure is taken into account in the dependent variable and used as an explanatory variable.

Thanks in advance