How expensive is bulking up

I am 22m on the brink of graduation, i am realizing that it's time to tackle adulthood with confidence. And for me, that means addressing my lifelong struggle of being on the skinny side. I want to bulk up, not just for the gains but for the self-confidence that comes with it and just to be more attractive overall.But here's the kicker my bank account is as barren as that of a typical comrade

Here's the fun twist: I've been told that i weighed a whooping 4kg when i was born.So, if i managed to rock those baby gains while in the womb, surely I can bring that same energy now, right?

Now, about the financial side of things. I'm fully aware that food will be my biggest expenditure on this journey, but before I commit , I need some guidance on the overall cost. I know that different gyms have different prices, but i am hoping to find the most optimal way to bulk up without breaking bank. Also, i have set a rather ambitious goal to bulk up by the end of the year. Is this plausible? I am currently in Rongai, ready to kickstart this transformation. I need any gain tips, tricks and cost effective strategies. Success stories will be highly appreciated for people who have been in such a predicament.