Buying bitcoin with the money that was given to you on tour birthday is a wise decision but how will you hodli that bitcoin for long when you don't have a means of income.
Find a job. Or if you're a student over 18, a part-time job. But if you're a student below 18, wash your dad's car and give your mother a massage, then ask them for a higher allowance. Hahaha.

If you are faced with a big challenge, you will not hesitate to sell your bitcoin to solve the problem and become a no coiner. Even investors that have a regular means of income do sell their bitcoin if they don't have an emergency funds. No bitcoin investment will grow without a source of income and an emergency funds.
You have bought bitcoin and you cannot continue investing to grow your bitcoin portfolio, and it is just stagnant, you might not have any profit for a long time especially if bitcoin price is below your entry point overtime. The aim of investing is to grow your bitcoin investment to a particular size that will be able to give your some profits over time, and also keeping the value of your funds from depreciating. The first thing to do if you want to invest in bitcoin is to get a means of income , from there you can take from your discretionary income to buy bitcoin regularly using DCA weekly or monthly consistently without stopping for 4-10 years.
Emergency funds is very important, and you can use the left over from your discretionary income to build your emergency funds up to 3-6 months, after which you can also build your reserve funds. All these put together with discipline will make you not sell your bitcoin before time.
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If a person is single and has ZERO responsibilities, take that limited opportunity and keep buying Bitcoin - the DIP or DCA - and HODL, then keep adding more.