You will never regret investing in Bitcoin. But first, you should learn about Bitcoin, how to open and handle your wallets and how the investment in it works. Not that you will just start investing in what you do not understand simply because a friend told you to do so. Mind you, it is a very risky affair if you allow your friend to open your wallet for you, the risk is high and he could steal your money in the future if he so desires. This is one of the mistakes that people make but will be crying foul later. Bitcoin and any online assets are yours and yours alone, you should be the one to keep it and know all the accesses to it, and not a third party, not even your family member.

Fine the friend has done his part to introduce you to Bitcoin, you should do your part to learn and it and know the dos and don'ts about it. By this, you will know how to own your wallet by yourself, make a deposit and withdrawals as the case may be, and also store your coins safely.

I repeat, don't ever let your friend open your wallet for you, nor let anyone know your access keys and codes.