First off, congratulations on your VS offer! You should be very proud of yourself as it’s a great achievement
In no way should you feel bad; I think the way you feel right now is understandable if you had your heart set on a particular firm and the “consolation prize” part makes sense.
If I’m honest, I think if this does turn out to be your only VS this cycle and you do (hopefully) convert it into a TC, it would likely be a mistake not to take it. TCs are very hard to come by (as I’m sure you’ve experienced!) and to be in the position to have one is something I feel you should take with both hands. Even if the practice areas or firm’s specialisms don’t entirely align with your original goals, you may end up surprised during your seats at what you enjoy. In any event, if it’s a full service firm, you’ll still likely gain exposure to your standard corporate, finance, employment, real estate etc seats, even if the firm isn’t a Legal 500 Band 1 for them.
Moreover, you’re not tied to that firm forever. A TC only lasts 2 years and once you’re qualified, you can move laterally to another firm and plenty people will do that.
I’d advise you take the offer if successful; I imagine it’ll turn out to be an excellent decision and you’ll thrive. Best of luck!