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Sorry if I'm a brainlet I don't post on fitness related forums often.

So I never really been fat but recently (probably because of quarantine) I've noticed I've became a little "jiggly". And the most I do in terms of fitness is walk to the store every now and then. So I decided I would pay more attention to my fitness.
So I did 10 push ups for each episode of anime I watch today. So 40 so far. My arms felt tense or stressed but then kind of feels good. Would it do anything though? I don't want to put in all this extra work if my belly stays jiggly and I don't grow any muscle.
It's probably worth mentioning my diet consists of pizza and cola mostly... I don't want to change that, I like pizza and cola too much.

Pic not related